I’ll never forget the days ____ I spent in Beijing last year.

he university claims that a(n) _______international student requires $ 12,000 to cover the cost of livingin one academic year.[ ]

She was too busy ______________ with me at that time. I was unhappy about that.

rried to her office by taxi, only_____ that the key had been left at home.

Sarah pretended to be cheerful，________nothing about the argument.(2011·全国Ⅱ)