【推荐1】Natural resources are things     1     exist in nature and can be used by people. Some natural resources are renewable, like trees. When one tree is cut down, we can plant a new tree to replace it. Others,     2    , are not renewable, like the coal dug out of the ground. Once it is used, it is     3    . (go)

Although we all know that our natural resources are limited, we often waste them in our daily life. Paper, bottles and cans     4     (throw) away carelessly; food is wasted just because of  its  poor  taste; clothes  are  rejected     5     (simple) due  to  their  old fashion. These valuable natural resources will run out before long     6     better use is made of them.

Actually, everyone can make contributions (贡献) to     7     (protect) our natural resources. For example,     8    riding a bicycle or walking instead of driving, we can save lots of petrol. Water is a very important natural resource because we all need     9     to stay alive. We can make wise    10     (choose) to save water, like reusing the water that has been used to wash vegetables to water flowers.

【推荐2】When I called    1    my mother, she told me snakes came near the house now and then. Here was a chance for me to distinguish     2    (my) by inventing something merciful that would seize snakes but not harm them. I tried to find some products    3    might help me, but there only seemed to be    4    (powder) designed to kill snakes. I set about    5    (research) the habits of snakes. Prepared with some research findings, I    6     (decide) on three possible approaches. I chose the most practical one to cool the snakes with frozen bowl and ice-cream so that they would become sleepy    7    could be easily caught. My third attempt was     8    (success). I carried in my hand a small net in the expectation that the snakes would bite again. But     9     (monitor) carefully, the snakes proved to be no trouble. I collected the passive snakes and the next day and    10    (merry) released them all back into the wild.

【推荐3】A BBC film crew was working on the remote Lord Howe Island for a new wildlife documentary called Drowning in Plastic. They filmed many birds that     1     (die) for no clear reason. After some research, they found out the truth—    2     caused the death of the birds was that their stomachs were literally too full of plastic. The documentary team also filmed biologists     3     (work) on the island to save the birds. The scientists captured hundreds of chicks and removed plastic from their stomachs to give them a chance of     4     (survive).

Recent months have seen a return of bikes across China. With an increasing number of people choosing cycling instead of     1    (drive) to schools, to workplaces or to do sightseeing, the introduction of bike­sharing programs has brought the trend to a new level.

The bikes     2    (equip) with GPS and can be left anywhere in public for the next user. They’re popular among many Chinese people as they provide     3    effective solution in places     4    it’s difficult to change from one kind of transport to another. Bike­sharing is a     5    (green) method of transportation and     6    (provide) a more friendly experience.

However, the programs have also led to problems such as     7    (legal) parking, deliberate (蓄意的) damage and theft. To deal with these problems, the company came up with the idea of encouraging people     8    (return) the bikes to stations     9    rewarding free time for their next rides. Now, Chinese service operators are also trying to address these problems, too. For example, Mobike sets a 100­point credit score for each user, with     10    (point) taken in the case of bad behavior. Once a score drops below 80, the bike rental is increased to 100 yuan per 30 minutes, up from 0.5­1 yuan.