Zhou Dan is only four years old,but he loves ________ English songs.
— Could you tell me ______? I must find him. — Sorry. I have no idea. But he was here just now.
---Did you go to the cinema last Sunday? ---Oh, no. I _____________ go to the cinema. The tickets , you know, are too expensive.
At that moment I had no choice but _____________ the policeman for help.
I’m very worried because I have made ________________ progress in my math.
You never know how much difficulty we had _________________ the problem. Luckily, we try to solve it with Mrs Wu’s help.