2 . In fact, exercise is highly _____________ (benefit) to health. (所给词的适当形式填空)

3 . Experts point out that there is a good way to solve the _________ (exist) problem. (所给词的适当形式填空)

4 . From the _______________ (astonish) look on his face, I realized that he had never expected the performance to be such a great success. (所给词的适当形式填空)

5 . As I always tell my son, there are no great difficulties for a person who is brave, _______________ (optimism), and willing to work hard. (所给词的适当形式填空)

6 . ________ a consequence, children become so reliant on their parents that they have no ________(dependent)thoughts or creative ideas. （所给词的适当形式填空）

7 . None of the passengers and crew were __________ (injure). (所给词的适当形式填空)

8 . This is the most __________ (advance) type of engine available. (所给词的适当形式填空)

9 . His father gets pretty __________ (confuse) sometimes, and doesn’t even know what day it is. (所给词的适当形式填空)

10 . Many students find the experience of attending university lectures to be a ________ (confuse) and frustrating experience. (所给词的适当形式填空)