Down __________ and hurt his leg.

A. fell the boy  B. fell he

C. did he fall   D. did the boy fell

The house could fall down soon if no one       some quick repair work.

1. A.
   has done
2. B.
   is doing
3. C.
   does
4. D.
   had done

The house could fall down soon if no one ______ some quick repair work.

A. does????????????? ????????????? ????????????? B. has done???????? C. is doing????????????? ????????????? ??????? D. had done

 Autumn coming, down ________.

A. do the leaves fall                 B. the leaves will fall  

C. fall the leaves                                D. the leaves are falling

The house could fall down soon if no one       some quick repair work.

A、has done     B、is doing      C、does     D、had done