People should _____ into the habit of garbage sorting(垃圾分类) in neighborhood.
A. get B. give C. go D. grow
Mother encouraged the little Tom _____ his special experience in the blog.
A. share B. to share
C. shared D. gain
People _____ to set off firecrackers in some areas of Shanghai for several months.
A. aren’t allowed B. weren’t allowed
C. won’t be allowed D. haven’t been allowed
Scientists warn that El Niño _____ the world this coming summer.
A. damaged B. had damaged
C. was damaging D. will damage
By the time I got to the check-out, I realized that I _____ my purse at my office.
A. have left B. had left
C. left D. was leaving
John was so sleepy that he could hardly keep his eyes _____.
A. open B. opened C. to open D. opening
