Now one of the most serious problems many people are worried about _____ on the lack of adequate housing space.
9. 一I must apologize_____ you know ahead of time. 一That’s all right.
8. She says I hurt her feeling,but l didn’t ____.
7. Everything changes _____.What was not accepted in the past may be very popular with people now.
6. He _____ to lend me his bicycle but I refused.for I didn’t want to trouble him.
5. ______animals like wolves and bears usually hunt for small animals for food.