Sometimes, the kind of food we serve a person suggests _____ we show our gratitude.
A. when B. what
C. why D. how
—I heard Mr. Morgan would be here at 4:00 pm. next Thursday.
—No, he _____ at that time.
A. was boarding B. would be boarding
C. will be boarding D. is boarding
Repairs of historic buildings have to be _____ the original structure.
A. in sympathy with B. in search of
C. in response to D. in contrast to
After nine years working to protect Siberian tigers, Yang Jun _____ his efforts recognized at the annual award ceremony in Beijing where he was named a "wildlife protector".
A. had B. had had
C. has had D. has
The emoticons _____ when we want to stop a conversation, sparing us the embarrassment.
A. come around B. come in handy
C. come about D. come by
In the "moon garden" onboard the Chang'e 4, the shoots of cotton marked the first live matter ever _____ on the moon.
A. having grown B. to be grown
C. being grown D. grown
