All possible means to save the wounded soldier.
| A．has been tried | B．have been tried |
| C．is to be tried | D．are trying |
Some researchers believed that there is no doubta cure for AIDS will be found.
| A．which | B．that | C．what | D．whether |
— Shall I give you a ride since you live so far away?
— Thank you. _______.
| A．It couldn’t be better | B．Of course you can |
| C．If you like | D．If you are convenient |
You’d better _____ some money for special use.
| A．pick up | B．set aside | C．put off | D．give away |
Many studentspreparing for the midterm examination.
| A．are engaging in | B．are engaging themselves |
| C．are engaging themselves | D．are engaged in |
________ from space, the earth , with water_______ seventy percent of the surface , looks like a blue ball.
| A．Seen ; covered | B．Seen ; covering |
| C．seeing ; covering | D．Seeing ; covering |