My father lost ____keys. Now he can’t get into the house, the office or the garage (车库).

To me, English is easier than_________subject to learn.

However busy we are, we need to take exercise. Not only___________us keep healthy, it also stops us getting fat.

Xi’an is really a fascinating city and we’ve decidedto stay for two weeks.

erely on what the average is , and you’ll remainaverage