—Jim, who taught ________Chinese before you came to school?—Nobody. I learned it by _______.
—Would you like to go hiking with us? —Sorry. My grandmother is ill. I'll go toher.
—What did the teacher say? —The teacher told us at the Capital Museum on time.
—Is that Jack speaking? —No. He isn't in right now. He to the cinema.
Mobile phones are very common now and they arethan before.
—have you been like this? —For a week.