--- Listen! David is talking happily with his mother in the next room.--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.
What are you doing,Tom? I am ______ my wallet now.
They look forward to _____ Harbin with us.
Miss Read is good ______ music. She is good ______ children in the Music Club.
We don’t like to climb the hill ______ a hot afternoon.
—Do you like English or maths? —______.