Virtual choir members record themselves while they perform alone on video. These videos are uploaded     1     the Internet, and then they are put together into one video that you can see online—a virtual choir. Anyone can     2     part in a virtual choir from anywhere—all you need is a video camera and an Internet connection. You do not even need a     3    . A virtual choir helps connect     4     people together.

As a five-year-old girl, Lin Qiaozhi was deeply affected by her mother’s death. At age 18, instead     1     following the traditional path of marriage like the     2     of girls, she chose to study medicine. “Why should girls learn so much? Finding a good husband should be their final goal!” her brother     3    , thinking of the high tuition     4    . She responded, “I’d rather stay single to study all my life!”

If you start to have sleep or weight problems, it will send a     1     to your phone. It will also give you suggestions on a healthier diet and     2     to sleep better. Smart toilets will be keeping constant track of your health as well. They can warn you early on if there is something     3     or if you have a critical illness, such as     4     , and potentially save your life.

On 4 October 1957, the Sputnik 1     1     was launched by the USSR and successfully orbited around the Earth. Afterwards, the USSR focused     2     sending people into space,    3     on 12 April 1961, Yuri Gagarin became the first person in the world to enter space.

Of all the traditional festivals, the     1     festival can be found in almost every culture. This important agricultural festival takes place after all the     2     have been     3     in. People celebrate to show that they are     4     for the year’s supply of food.

Personally speaking,     1     I like most about Australia is the people themselves. They have a     2     and free-and-easy attitude     3     life, and their friendliness and warmth made me     4     at home wherever I went.

My     1     school is a bush school. The classrooms are     2     of bamboo, with clay floors and roofs of grass. It takes me only a few minutes to walk to school down a     3     track covered in     4    .

These bad habits, if left unchecked, could     1     to more serious ones when they become adults. For example, some of them may become     2     in tobacco or alcohol     3     , which can lead to physical and mental health problems. To     4     harmful habits like these from dominating a teenager's life is essential.

But I was so     1     about the idea of going along with them that I secretly went     2     his ship, the Endurance, and hid in a small     3     . Unfortunately, three days after we set     4     I was discovered.