Mountain climbing ______ be really dangerous at times even though it is challenging and exciting in general.

Would you like ____ basketballwith us— I’d love to, but I feel like ____something first.

Shall we have roast chicken or ham sandwich — __________________.

I ___________in the No.8 Middle School for three years, and I have been in this school for one and a half years.

Will you go to Shanghai _______ plane —No. It costs too much. We will go there _______ a train.