3. 过马路时一定要注意车辆。

Do     vehicles when you cross the street.

2. 砟晚这家旅馆发生了火灾。

      in this hotel last night.

1.振作起来吧！你的困难不久就会过去的。

   ! Your troubles will soon be over.

5. It's possible . he hasn’ t received the letter. 

4. John will arrive is unknown. Maybe two hours later.

3. we’ 11 do is leave a note for Mum to tell her we won’ t be back till late.

2. It doesn't matter it turns out to be a good idea or a bad idea.

用适当的连接词填空。

1. will be sent to carry out the task hasn't been settled.

II.下面各句均有一处错误，请找出并改正。

2. If they will go there or not to try another experiment hasn’t been decided. 

3. Why caused dinosaurs to disappear from the earth is still a puzzle.

4. What we lived ten years ago had changed so much that I nearly lost my way while visiting there. 

5. My son was a quiet and (温和的) man who liked sports and enjoyed life.