1 . Some people think ______ necessary to explore the oceans because of the potential amounts of resources. (用适当的词填空)

2 . She finds ___________ challenging to balance her social life with her study. (用适当的词填空)

3 . So loudly did Tony speak that he could make ______ (he) heard by others. （所给词的适当形式填空）

4 . Communicating through a screen makes ____________ more difficult for children to concentrate. （用适当的词填空）

5 . Some people consider _______ a waste of time surfing the Internet, while others hold different opinions. (用适当的词填空)

6 . ________ is urged that the public should promote their awareness to protect the rare animal. (用适当的词填空)

7 . Dangerous conditions and damaged roads will make ____________ quite difficult to deliver food and supplies. (用适当的词填空)

8 . I found ______ strange that my teacher could not show me love. (用适当的词填空)

9 . I consider ___________ necessary to inform people of the severity of the infection disease. (用适当的词填空)

10 . ________is no good eating too much sweet food. （用适当的词填空）