21．Have you heard_____report? People with______good knowledge of engineering are in great need in the job market.
| A．a; a | B．the; a | C．a; / | D．the;/ |
The rising______did a lot of______to the crops.
| A．water; harm | B．water; harms |
| C．waters; harm | D．waters; harms |
——How far away is it from here to your school?
——It’s about ________..
| A．half an hour’s drive | B．half hours drives |
| C．half an hour drives | D．half an hour drive |
The shirt isn’t mine. It’s______.
| A．Mrs Smith | B．Mrs’ Smith |
| C．Mrs Smiths’ | D．Mrs Smith’s |
Miss Johnson is a friend of_______. .
| A．Mary’s mother | B．Mary’s mothers’ |
| C．Mary mother’s | D．Mary’s mother’s |
Last week I called at my_________. .
| A．aunt | B．aunts | C．aunt’s | D．auntes’ |