1. The boy is too young to draw a                  (笔直的) line on the paper.
2. His interest in this subject will increase __________ (逐渐地).
3. Passengers are kindly r__________ not to smoke in the bus.
4. There is an __________ (表情) of anger on his face now.
5. He is so s__________ that no one can persuade him.
6. We are looking for someone who is                  (可靠的) and hard-working.
7. I'm rather c__________ about my mothr's health.
8. Sudden rainstorms are __________ (频繁的) on this coast.
9. Of the two the l__________ is far better than the former.
10. One of the d __________ of the job is the long work hours.