than _____on a crowed bus, I prefer____to work every day

Many people shop on line, ________ yearsago, they bought things only from stores.

I think running is an easy way to keep healthy.—— __________ , but Bill doesn’t think so.

What _______ the number of the students in your school—About two thousand. A number of them _______ from the countryside.

_______ impressed me was the boy’s ability to dealwith this kind of difficult physics problem.