1. Which train..................... for when I saw you on the platform on Sunday?

A. did you wait B. were you waiting C. have you waited D. are you waiting

2. I.................... not be home this evening. Phone me on my mobile.

A. can B. could C. may D. should

Sam asked me if I ............. a lift home after the concert.

A. had wanted B. wanted C would want D. want

( điền vào chỗ chấm giúp mk nha, và giải thích tại sao lại chọn từ đó( nói tiếng việt)