Some exchange students         with their host families this time yesterday.

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

My mother         the dishes when I got home.

While he ____ ____ (prepare) for the race, he fell ill suddenly and was sent to the hospital.

Bob took a photo of his girlfriend while she____ ____at the party. (dance)

Bob took a photo of his girlfriend while she           at the party.

—You were not in when I went to you yesterday.
—Oh, I         for a friend from England at the airport at that moment.

Millie         a picture when Mr.Green came in.

根据提示填空（每空一词）
She was watching TV at home at nine yesterday. (就加粗部分提问)
____ ____she ____ TV at home?

根据提示填空（每空一词）
Lucy was sleeping while Mary ____ ____ (read) a magazine.