—I don’t know ______ with this problem. It’s too hard. —You can ask Mr Wang for help.
Excuse me. I _______ I was blocking(挡) your way.
I ______ go to bed______ my mother came back home.
---She’s never been to Hainan, ________?---________. She went there last week for the first time.
---Why did you buy a radio?--- ______ English.
---Could you please come to the museum with me this afternoon?---Sorry, I ______ . I have to take a piano lesson at 2 pm.