Can you imagine singing together with hundreds of other people     1     you are at home alone? You can do this in a virtual choir. All you need is a video camera and an Internet connection. A virtual choir     2     (enable) people to add their voices     3    those of other individuals. The virtual choir was the idea of Eric Whiteacre     4     is an American composer and conductor. He began studying music in 1988 and got     5    master’s degree in 1997. After that, he accomplished many well-received     6     (composition). In 2009,     7     (inspire) by a video he received from a girl     8     (sing) one of his works, he created his first virtual choir. Later, his song “What if”     9     (put) on a performance on 23 July 2014 in the UK.

The virtual choir is a wonderful way to sing with one voice and thus make the world a     10     (good) place.

Air travel makes both people and service dogs very nervous. There are classes     1    people get help to defeat their fear of flying. And there is similar training for service dogs     2     (suffer) the same problem. You will     3     (frequent) see them working on buses, trains and other public transport systems. But the busy environment found at an airport can trouble even the     4     (good) trained service dogs. People with disabilities depend on     5     (they) dogs. They should be reliable, and they can safely guide the people through security areas. It is especially when the flying is not smooth     6    they need the dogs to remain calm on duty on the airplane. It takes special training.

The Air Hollywood K9 Flight Center is a school where such help     7    guiding the disabled can be found. Dog trainers say successful training     8     (base) on a simple rule: preparation. Being exposed(暴露) repeatedly to the environment, to loud noises, to sounds, makes dogs used to acting and they don't get    9     ( excite), when they are trained on a daily basis.

Dog     10     (own) who have attended the training at Air Hollywood K9 Flight School — it was opened say they now feel much more at ease about future flights. Their dogs also seem ready for takeoff.

Nowadays when     1     (face) with health or nutrition (营养) questions, people    2     (probable) turn to the Internet     3     help. But they may get some wrong advice online,     4     is very dangerous! In addition, search engines show clicking rates looking into popularity rather than accuracy (准确). So useful advice can not be easy     5     (find). It is well worth     6     (check) whether the advice is helpful. After all, anyone can call themselves     7     diet expert, and even a doctor. But remember, only officially recognized doctors and dietitians (营养学家) have rights to give medical     8     (suggest). So if you are unsure, you’d better visit a doctor. Go to the right place,     9     the real answers can     10     (find).

Every year around Valentine’s Day, men begin to worry about what     1     (present) to buy and women     2     (fill) with hope and expectation. Or the other way around. In China, more couples get married on that very day,     3     (add) romance to their promises. But for many, love is neither the matter-of-course choice     4     the preferred one. More young, working urban residents are delaying or even choosing not to     5     (active) seek their partners despite the social pressure from the older generations to do so.

Over the years, China’s divorce rate has exceeded (超过) that of marriage. According to the statistics from the Ministry of Civil Affairs, 10 million couples registered for marriage in 2017 fell by 7%     6     (compare) with the same period last year, while 43.7 million couples divorced, 5.2% more than the same period last year.

There is also a growing trend towards people marrying later: since 2013, the number of couples aged 25 to 29 has been greater than     7     of younger couples. In the     8     (late) survey on professional attitudes towards love and marriage, more than half of the investigated in Yangzhou,     9     second-level city on the East coast, were satisfied     10     their marriage after 35.