Who’s that boy reading in the garden? Is it David?— It ____________ be David. I saw him in the classroom just now．

Mum, I’m going out with my classmate tonight. —OK. But you’d better _____ back too late.

My friend Amy often takes walk with her dog in the park after dinner.

31. It’s two weeks since we _______ the work in Beijing Ren’ai Education Institute .

The soap opera “Young Lives” is. We are allin it.