--- Mum, have you seen my mobile phone?--- _________you bought last week? I’m sorry I haven’t seen _________.
We should spend as much time as we can ______ English.
There are different kinds of presents in the gift shop. I can’t decide _______.
I want to know____________.
There_____ a large number of students in the hall, and the number of the students_____ more than 3000.
Yesterday I met Sandy. We ________ since ______ middle school.