It’s necessary ___________ us _____________ more trees in spring every year.
A. of； to plant B. for； to plant
C. of； planting D. for； planting
--- You never have sweet snacks， do you?
--- ____________. Though I know they’re bad for our health.
A. Yes B. No C. Yes， I don’t D. No， I do
He has worked in the city _______ three years ago while his wife has been here______only one month.
A. since ， for B. since， since
C. for， since D. for， since
_______ of the people here live on rice， and the people there ______ live on rice too.
A. Mostly， most B. Most， almost
C. Mostly， almost D. Most， mostly
_______ great fun it is to swim in the deep sea.
A. What B. What a C. How D. How a
Though it was very late， they __________ their discussion.
A. continued with B. went on
C. continued on D. carried on with
