21. —New kinds of morning exercise like doing dancing are becoming popular.

　　—     can help us keep fit and have fun.

　　A. WeB. YouC. They

　　22. You can’t decide whether or not you like something until you try it,   

　　it’s important to try something new.

　　A. butB. orC. so

　　23. Parents should let children     home and find more about the world.

　　After all, birds should fly freely in the sky.

　　A. leaveB. enterC. reach

　　24. When we read a piece of news online, we’d better make sure it’s   

　　before sending it to others. If not, we may spread something bad.

　　A. trueB. specialC. strange

　　25. To keep our city beautiful, the     are always very busy in the streets.We shouldn’t throw rubbish everywhere.

　　A. policemenB. cleanersC. drivers

　　26. —Our motherland’s 70th birthday is coming.

　　—Great! We will hold many activities to celebrate it     .

　　A. wiselyB. warmlyC. simply

　　27. Fighting for your dream is like climbing a mountain. Whatever difficulties you meet, don’t     . Just move on.

　　A. set offB. come outC. give up

　　28. Change the information you read into a mind map.     , you canremember it well and think of it later easily.

　　A. In this wayB. At the same timeC. On the other hand

　　29. —After the big exams, we can finally have a good relax.

　　—How I     a chance to have a chance to have a trip! I can’t wait.

　　A. am worried aboutB. am thirsty forC. am good at

　　30. —Some school have used used smart uniforms. I wonder     .

　　—They can tell parents where their children are.

　　A. who invented them

　　B. what they are used for

　　C . when students wear them

　　【答案】21-25 CCAAB 26-30BCABB