—Why are you so excited?
—All of us take pride ________ the successful coming back of the Shenzhou-13.
in
on
at
—Tom, how does your mother go to work every morning? —______ goes to work by car.
—Can you play ______ piano? —Yes, I can, but I’m not good at it.
Talking with foreigners is a useful way to ____ /ɪm'pru:v/ our English.
We should eat more fruit and vegetables to keep ______/'helθɪ/.
Please open the window and let the _____ /freʃ/air in.