2 . The sun had ________ in the west when only a small part of their crops were harvested. And when they heard that there was going to be a rainstorm the following morning, their hearts ________.(sink) (所给词的适当形式填空)

4 . 写出黑体词的词性和词义
1. To my sadness, my son was abandoned to smoking and drinking. ________
2. Jenna threw the burnt piece into the sink and put in the other slice of bread. ________
3. The bark of the young tree was removed and soon it died. ________

6 . 大卫只走了几米就绊了一跤，倒在地上，这使我的心沉了下去。
David had only gone a few metres before he tripped and fell flat on the ground，________________．

10 . Choose the appropriate word to complete each sentence.
1. The fire alarm caused a panic/worry in the theatre and the crowd fled in all directions.
2. Although my grandpa is retired, he is very enthusiastic/concerned about volunteer work.
3. The officer was assigned/employed to conduct a thorough investigation into the incident.
4. The sun was sinking/falling behind the mountains when we reached the top.
5. It took him a lot of vigour/energy to move all the items of furniture inside the house.