1 . Berners-Lee made ________ possible for everyone to use the Internet. （用适当的词填空）

2 . _______ suddenly occurred to him that he had left his keys in the office.

3 . We must make________clear to the public that something should be done to stop pollution. (用适当的词填空)

4 . In his introduction, he made ________ clear that our credits would be hard to earn. (用适当的词填空)

5 . ___________seems that he has known the news. (用适当的词填空)

6 . ______ is hardly any wonder that he almost fails in the examination. (用适当的词填空)

7 . My parents have always made ________ clear that we shouldn't judge a book by its cover. (用适当的词填空)

8 . In our daily life, WeChat makes ________ easy for people to communicate with each other. (用适当的词填空)

9 . It is no use ________ (tell) him the witty words , because he never smiles. (所给词的适当形式填空）

10 . There is no denying that volunteers consider ____________ important for them to protect the historical sites in China.