1 . The scientists are trying to learn about he harmful effects of ________(化学品) on humans and on the world’s lakes and the ocean. （根据汉语提示单词拼写）

2 . The exhibit hopes to leave the best ________ (印象) on students. (根据汉语提示单词拼写）

3 . Not being able to find a travel c________(同伴), he had to go alone.（根据中英文提示填空）

4 . The man talked endlessly, but the teenagers listened to him with ____________(耐心). (根据汉语提示单词拼写)

5 . It is a study based on ____________(观察) of a group of 20 patients. (根据汉语提示单词拼写)

6 . Mary had tried and failed many times so her success was beyond our e_______(期望，预期). (根据中英文提示单词拼写)

7 . It is quite surprising that some ideas in the science fiction have already become ________ (现实）（根据汉语提示单词拼写）

8 . Can you tell me the way to the_________（地铁)?(根据汉语提示单词拼写)

9 . The young man, having made several finally a_________to beat the world record in the high jump, decided to have another try.

10 . Technical i________ is a method of winning victory in market competition. (根据首字母单词拼写)