—The U.S. has to have the most deaths from COVID-19 (新冠肺炎) in the world.
— I’m sorry to hear that.
A.carried out B.found out C.put out D.turned out
— What do you need to prepare for the entrance examination?
— Support from my family and friends is all________ I need.
A.what B.which C.why D.who
— How do you find the price now?
— As a________rule, prices follow needs.
A.private B.general C.central D.fixed
Artemisinin (青蒿素) was first________ by Chinese scientist Tu Youyou in the 1970s.
A.invented B.created C.produced D.discovered
— Could you clean up the living room and take out the rubbish, Andrew?
— Of course! Seeing this________, Mom will be mad, I think.
A.difficulty B.matter C.mess D.wonder
Extreme sports such as rock climbing can be very dangerous, so we________ be too careful.
A.can’t B.mustn’t C.shouldn’t D.needn’t
