This is the first time we _________ by air.
A. have travelled
B. travelled
C. was travelling
D. travel

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A. Most young people go to college
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Where did the meteorite hit? What’s the indirect question?
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The students made a mess in the classroom after their art lesson. Mrs Tan made them __________ it up before they could go for recess.
A. cleaning
B. cleaned
C. cleans
D. clean