Li Ming is said ______ the experiment in the lab, but I can’t find him there.
| A．to have done | B．to do | C．to be doing | D．doing |
--I’m going to the States?
--How long ________ you________ in the States?
| A．are; stayed | B．are; staying | C．have; stayed | D．did; stay |
Rather than _________ on a crowded bus, he always prefers _________ a bicycle.
| A．ride; ride | B．riding; ride | C．ride; to ride | D．to ride; riding |
__________ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．Lots | D．The number |
He realized she was crying ________ his words.
| A．because | B．because of | C．as | D．since |
Mary, ________ here. Everybody else, stay where you are.
| A．come | B．comes | C．to come | D．coming |