John ______ in his room when he heard screaming.
| A．is studying | B．studied | C．was studying | D．has studied |
With more forests being destroyed, huge quantities of good earth_______ each year．
| A．is washing away | B．is being washed away |
| C．are washing away | D．are being washed away |
_______in the forests for nearly a week, the two students were finally saved by the local police．
| A．Having lost | B．Lost | C．Being lost | D．Losing |
The place______ the bridge is supported to be built should be _____ the cross river traffic is the heaviest
| A．which; where | B．at which; which |
| C．at which; where | D．which; in which |
_____ walk is expected to last all day, so bring_____ packed lunch．
| A．A; a | B．The; X | C．The; a | D．A;X |
----Could you do me a favor and take these books to my office?
---- Yes．_______．
| A．for pleasure | B．I could | C．my pleasure | D．with pleasure |