青少年心理健康的核心是保持愉快的心情。（     ）

根据汉语完成句子。

1. 我长大了想当一名工程师.

   I'm going to __________________when I grow up.

2. John4岁时会骑自行车.

    John ______________________ at the age of 4.

3. 这个箱子太重,我搬不动.

   The box is _________ for me __________ carry.

4. 我们数学老师比语文老师严肃.

   Our math teacher ________________________ than our Chinese teacher.

5. 由于这场雨,昨天他没去北京.

  He didn't go to Beijing ________________ the rain.

6. 让我为你整理床铺吧!

   Let me __________________________ for you.

7. — 他怎么了? — 他肚子疼. 

    — What's the matter with him? 

    — He _________________________.

8.我爸爸星期二要动身去香港.

   My father ______________________ Hong Kong on Tuesday.

9. 我打算搬到一个安静的地方.

   I am going to move _________________________.

10. Tom打算学一门外语.

     Tom is going to ___________________________.