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 |
– Did you visit the famous museum?
– No. We ______ it, but we spent too much time shopping.
A. could have visited B. must have visited
can’t have visited D. shouldn’t have visited
The countryside gives us peace and quiet, which is ______ we can’t enjoy living in the city.
A. that B. what 
why D. where
This problem is said _____ three times at the meeting. However, they haven’t arrived at a conclusion now.
A. to have discussed B. to have been discussed
having been discussed D. having discussed
______ his knowledge of the mountainous country, John Smith was appointed as our guide.
A. In spite of B. On account of 
Regardless of D. Instead of
with; compared with D. by; comparing with
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