2 . These frogs, in turn, feed on insects ________ eat leaves and fruit. （用适当的词填空）

3 . Over the past 50 years, about 17 per cent of the rainforest ________(disappear) due to human activities such as agriculture and cattle farming. （所给词的适当形式填空）

4 . The villagers, all of ________ houses had been damaged by the fire, were given help by the Red Cross. (用适当的词填空)

5 . We were all very grateful to John, _________ help contributed greatly to our success. (用适当的词填空)

6 . When first________(introduce) to the market, these products enjoyed great success. (所给词的适当形式填空)

7 . When ________(offer) help, one often says “Thank you” or “It’s kind of you”. (所给词的适当形式填空)

8 . When you ________ (能够处理)the challenges, you will have the opportunity to acquire great knowledge and enjoy personal growth.（根据汉语提示完成句子）

9 . ________ ________ (万一) you should need any help, here’s my phone number.（根据汉语提示完成句子）