If you ________ smoke in the room, please keep the windows open.
| A．should | B．may | C．shall | D．must |
Never before______ such a wonderful park, ______ I'd like to pay a visit again.
| A．had I seen; where | B．have I seen; which | C．have I seen; where | D．had I seen; which |
The manager asked me to______ the report, because he didn't want to speak for a long time at the meeting.
| A．cut out | B．cut away | C．cut off | D．cut down |
With the word "PM2.5"______ heard and seen in our life, people become more and more concerned about air pollution.
| A．constantly | B．occasionally | C．consequently | D．contemporarily |
— The deadline is drawing, but I failed to challenge the task a third time.
— ______ my brother have a try?
| A．Will | B．May | C．Shall | D．Must |
Mr. Zhang once taught in a remote village in Anhui province as a volunteer, which was ______ only on foot.
| A．acceptable | B．accessible | C．available | D．appropriate |