— _____do they surf on the internet ?—Twice a week. 

 I visit my grandparents __________ Saturday afternoon.

--How about going to school by boat, Lilei? --Good idea. That must be ___________than taking a bus.

 What a shame that there are so many people there, but ______ dare stop the crime(违法、犯罪行为).

The boys and girls follow Yao Ming all the time.