【推荐1】For a long time, he just stared at the blank before him, merrily, ________ (sink) in sweet memories in the past. (所给词的适当形式填空)

【推荐3】______ (sink) below 200 meters, we enter the twilight zone. （所给词的适当形式填空）

【推荐1】Bill ________ his hand to us and then drove away. (wave) (所给词的适当形式填空)

【推荐2】单句语法填空
1. He ________ attend the meeting the day before yesterday, because I saw him enter the meeting room.
2. When ________ earth did you go to see your parents last month?
3. She decided to take the exploration by herself, ________ she knew that it was dangerous.
4. I wonder where ________ was that you lost your credit card.
5. It was my mother who ________（teach）me to be curious about everything around me.
6. This is the ________ book that I have been looking for.
7. I'm still wondering ________ it was that put the Christmas gift under my pillow.
8. There are more than 740 million Chinese people ________（expose）to second-hand smoking in public places now.
9. To their ________（disappoint）, the result was contrary to their expectation.
10. Many diseases arise from ________ people really don't know about in their daily life.

【推荐3】Police said the accident__________(occur)at about 4：30 pm. (所给词的适当形式填空)