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
_____ this is your first visit to New York, you’d better learn some of the customs.
A. Unless B. Since C. Although D. Until
Stick to your dreams, _____ they will come true one day.
A. so B. or C. too D. and
My father doesn’t like the food others cook at all. He _____ goes to the restaurants.
A. never B. often C. sometimes D. always
