—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
The time isn’t far away ______ you will have to take the college entrance examination．
| A．when | B．as | C．until | D．since |
Equipped with modern facilities, today’s hospitals are quite different from_______ of the past．
| A．that | B．those | C．one | D．ones |
---“What do you think of the service here?”
---“Oh, _________ ．We couldn’t have found a better place．”
| A．too bad | B．sorry | C．wonderful | D．impossible |
While working on the farm， the students ________ a good knowledge of plant life
| A．held up | B．picked up | C．turned away | D．put down |
I don’t understand what the engineer means, but I’ve got____rough idea of ____ project plan．
| A．the; a | B．不填; the | C．the; 不填 | D．a; the |