Chọn đáp án đúng nhất

1. Lan is an outstanding student. I look ………. her very much.
A. up B. upto C. at D. down on
2. They have cut …………. the trees in the garden to build a high building.
A. on B. into C. away D. down
3. Yesterday, I went to the airport to see …….. my friend.
A. on B. at C. off D. of
4. The plane took ……… 4 minutes ago.
A. off B. up C. after D. on