—Who ________ it be that is knocking at the door?
—It________ be Mother, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
After hours of repair, the driver tried to start the machine but it _________ work.
| A．won’t | B．shouldn’t | C．wouldn’t | D．couldn’t |
His room needs _______,so he must have it ________.
| A．painting ; painted | B．painted ; painting |
| C．painting ; painting | D．painted ; painted |
_______ difficulty we meet with, we must finish it on time, because the opportunity is_______ valuable．
| A．Whatever; such | B．However; such | C．However; so | D．Whatever, that |
Is this hotel ________you said we were to stay in your letter?
| A．where | B．the one | C．which | D．in which |
After five hours’ drive, they reached____they thought was the place they had been dreaming.
| A．that | B．where | C．which | D．what |