Tom was walking along the riverside when he heard someone calling him from behind. He turned around_______ found nothing.
— Would you like to go swimming with us this afternoon? — I’d love to. But I have to look after my cousin at home.
At first, I found it hard to follow the teacher because she spoke too quickly.
Would you please tell me _______ next, Mr Zhang?
---What a nice MP3! How long ______ you ______ it? ---Only two days.
Chinese _______ by more and more people in the world now.