1 . The disappearance of dinosaurs is not necessarily caused by astronomical incidents, but alternative explanations are hard ________.

A．found

B．to be found

C．finding

D．to find

2 . Studying in senior secondary school is a new life, which isn’t too hard to ____________________________(使你自己适应).  (根据汉语提示完成句子)

3 . 在我们的学习中取得进步并不容易。
It’s not easy to ________________ in our study.

6 . Rewards can stimulate people _____ (do) good deeds. (所给词的适当形式填空)

7 . I think part of the problem is how we educate people _______(work)in this field. (所给词的适当形式填空)

8 . Funds are available _________(assist) teachers who want to attend the conference. (所给词的适当形式填空)

9 . My teacher is always available _________(talk) to her students. (所给词的适当形式填空)

10 . Compared with adults, children are more eager (渴现的) to ________(探索世界) around them. (根据汉语提示完成句子)