____ it snowed heavily yesterday, nobody in our class missed the lesson．

________ Tom ________ Mary speaks good Chinese, so they can communicate with these Chinese students very well.

—Which do you prefer, tea or coffee?—I don’t care. ______ is fine.

A: _________ do you exercise? B: I exercise every day!

Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.