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Helen, where is your homework?Sorry, Miss Read. I some of it last night. But I haven’t finished doing it yet.

A. do
B. did
C. have done
D. will do

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Food scarce and expensive in the previous days.

A. was
B. is
C. had been
D. would be

Dumpling a traditional Chinese food.

A. was
B. is
C. had been
D. would be

The study also a direct link between obesity and mortality.

A. demonstrate
B. demonstrates
C. had demonstrated
D. demonstrated

When China and the United States their diplomatic engagement in the 1970s, Richard Nixon, Henry Kissinger, had to practice eating with chopsticks.

A. begin
B. are beginning
C. had begun
D. began