根据句意和所给音标写出单词。

1. My mother bought me a computer ___________ /geim/ on my ninth birthday.

2. Shall we go to the ___________ /zu: /first? I want to see the monkeys.

3. I don't drink ___________ /ti: /at night because it makes me feel difficult to fall asleep.

4. Most of the students in our city go to school by ___________ /baik/.

5. Can the scientists ___________ /ik'splein/ the reasons for changing the plan?