In the past several weeks, many cities in Northern China from heavy fogs and severe cold.
A. had suffered B. have been suffering C. were suffered D. suffered
she was out of the room, he took a quick look at the papers on her desk.
A. If B. While C. Though D. Unless
Visitors to the hills are greeted by signs them to look out.
A. warn B. to warn C. warning D. warned
It is already well understood causes the global warming.
A. what B. when C. that D. how
— Jim has gone to Britain to see a modern art exhibition.
— Oh, really? Do you know when he ?
A. leaves B. will leave C. was leaving D. left
— She looks rather upset. She the exam.
— I guess so. It’s very difficult after all.
A. must have failed B. can fail
C. would have failed D. should fail
