【正文】
living in ( ) 8. We see lighting ______________ we hear thunder. A. when B. before C. while D. after Task4用所給動(dòng)詞的適當(dāng)形式填空。 live in C. big enough。 two hundreds ( ) 7. The room is ______________ for us ______________. A. enough big。 two hundred C. thousands of。 felt ( ) 6. There are ____________ books in the library, and now there are about ____________ students reading in it. A. thousands of。 fall C. felt。 ( ) 1. The floor is dirty. Can you help us ______________? A. mop it up B. mop up it C. mop them up D. mop up them ( ) There was a rainstorm and the flood ______________ some houses last month. A.