I don’t know whether you happen _________, but I’m going to study in the U.S.A. this September. A. to be heard B. to be hearing C. to hear D. to have heard
Beijing was under an “orange” smog alert on Feb. 24, which marks the first time the second-highest warning level of a new system introduced last year_______.
---Why are so many northern Chinese visiting Southeast Asia countries recently?
---They are trying to get a ________ shelter from the cold weather in winter.