1. 爸爸太疲劳了，他一躺下就睡着了。

Father was too t       and               as soon as he lied down.

2. 为了节省时间，那位教授只问了我几个问题。

                      , the professor only asked me several questions.

3. 这些年来中国农村发生了巨大变化。 

Great changes               place these years in rural areas of china.

4. 请你说的慢一点好吗？我记不下来。