—Why do you look worried?
—There are so many problems______.
| A．remaining to settle | B．remained settling |
| C．remaining to be settled | D．remained to be settled |
A new bridge ______ across the river and it is expected to open next year.
| A．was building | B．is built | C．will build | D．is being built |
We appreciate ______ us know the change of the date for the meeting.
| A．him to let | B．him let | C．his letting | D．let |
This is a picture of Dr. Yuan, a scientist ____ is well known in our country.
| A．which | B．who | C．whom | D．whose |
Only when I left my parents for Italy ________ how much I loved them.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
There was _____ time _______ I hate to go to school.
| A．a, when | B．a, that | C．/, when | D．the, that |