Scientists have created GM tomatoes which ______ fresh for 45 days, three times as long as normal tomatoes.
| A．are stayed | B．have been stayed | C．stay | D．stayed |
Have you ever seen a doctor? If ______, what happened?
| A．any | B．ever | C．not | D．so |
_______ on the top of the hill is a monument, dating back to hundreds of years ago.
| A．Having stood | B．Standing | C．Being stood | D．Having been stood |
______ the poor living conditions, they continue to gather in the suburban villages because of low rents and easy transport.
| A．Except | B．Instead of | C．Despite | D．In case of |
The truck ran down the hill, and the driver _____, according to the local newspaper, to have been killed.
| A．was reported | B．was reporting | C．reported | D．had been reported |
This is not an economical way to get more water; ________, it is very expensive.
| A．in return | B．on the other hand | C．in a word | D．on the contrary |