Ⅵ.选择填空:从A、B、C、D中，选出一个最佳答案完成句子。
21. Bob is looking at the to find where Beihai Park is.
A. picture B. card C. map
22. TVs and computers can _________ our eyes to the outside world.
A clean up B. open up C. turn up
23. Look at the girls. They are playing _______ and feel _______.
A. happy; happily B. happily; happy C. happy; happy
24. They will be back ___________ .
A. for an hour B. an hour ago C. in an hour