— Mr. Lee ____ to a student when I entered the classroom this morning.-- He is very patient ____he is young.

The school day ______ at half past seven every morning.

 They have been doing morning exercises            they            up.

--- Where is your mother?--- She has ______ to Sichuan on business. She has ______ there four times recently.

 —Would you like to go and see avatar with me tonight?—Thank you very much, but I ___ it already.