The setting sun was reflected on the river, _______ everything along the banks_______all the more beautiful.
| A．to make; look | B．making; looking | C．making; look | D．making; to look |
—Where’s that report?—I brought it to you __________ you were in Mr. Black’s office yesterday.
| A．if | B．when | C．because | D．before |
The field research will take Joan and Paul about five months; it will be a long time __________ we meet them again.
| A．after | B．before | C．since | D．when |
It has been announced that candidates(应考者) ________ remain in their seats until all the papers have been collected.
| A．can | B．will |
| C．may | D．shall |
I ________ pay Tracy a visit, but I am not sure whether I will have time this Sunday.
| A．should | B．might |
| C．would | D．could |
The book was written in 1946, __________ the education system has witnessed great charges.
| A．when | B．during which | C．since then | D．since when |