Could you please come to the museum with me this afternoon?—Sorry，I ________．I have to take a piano lesson at 2 pm．

Were you at home at 9 o’clock last night? —–Yes, I a shower at that time.

Where is Paul, do you know?– He ________ the library. He won’t return until nine.

of the coats made of cotton. They feel comfortable.

I think the man over there must be Bob.— It _______ be him. He has gone to England.