They usually spend two hours _______ their homework every day.A. do B doing C to do
Give me your telephone number ____I need your help.
---Do you think the last problem in this math test difficult?---Yes. I could work it out.
---I’m going to take part in the piano competition next week.--- _____
---Why haven’t you asked her to come here?---She _______ an important experiment when I found her and she _____ it.
Because of the heavy traffic, it was already time for lunch break she got to her office.