____ time going on, our school becomes greener and more beautiful.
| A．Because of | B．Thanks to | C．As | D．With |
.It is morning _____ we have four classes, not afternoon.
| A．when | B．which | C．that | D．why |
Mother told Jim to watch the milk until it boiled and then _________ off the gas.
| A．turn | B．turning | C．turned | D．having turned |
The idea puzzled me so much that I stopped for a few seconds to try to _______.
| A．make it out | B．make it off | C．make it up | D．make it over |
One of the walls of the reading--room should be painted yellow, and ______.
A. the other is white B. the others white
C. the other white D, another is white
-- You know who came to our school yesterday?
-- Professor Smith? We once met at a conference.
-- ______. He came and gave a wonderful speech.
| A．How did you know that? | B．That was good news. |
| C．Got it! | D．Well Done! |