1. 结合语境，根据汉语或首字母提示用单词的适当形式填空。

1. （1） (暴露) to so many advertisements, we can't help being persuaded into buying something we don't really need.
3. （2） Has the government (宣布) that they will build a new highway to the mountain?
5. （3） It is said that the children are well (照顾) in the popular primary school.
7. （4） Finding a solution to this problem is one of the greatest (挑战) faced by scientists today.
9. （5） Professor White gave the students a speech yesterday and he (结束) his speech with an interesting story.
11. （6） He works in a sports centre i people how to keep healthy by doing exercise.
13. （7） The army was well-trained, and had little difficulty d the enemy.
15. （8） According to the report, the drug is s of causing over 200 deaths.
    
17. （9） The doctor is well-known for having c some people of the deadly disease.
19. （10） Those who can f difficulties on their way to success may keep calm when they really appear.