1. He __________ (假装)to be doing his homework when the teacher came in.
2. We were impressed by the ruins of an __________(古代的) building.
3. 31. Man should protect __________ (野生动物)for his own existence.
4. The amount of rain a__________(影响) the growth of crops.
5. Seeing him struggling in the river, we came to his         (营救) at once.
6. A __________ (音乐家)is a person who performs or writes music, especially as his/her job.
7.         Day(圣诞节) is December 25th.
8. The automobile caused a __________(革命) in our way of traveling.
9. He seized the great         (机遇) and got famous in the country.
10. He __________(代替) his brother as captain because his brother was ill.