Sarah had to stay at home and look after her grandma, _______?
A. did she B. didn’t she
C. had she D. hadn’t she
_____ useful information he has found on the Internet!
A. What a B. What C. How a D. How
---How long has the factory _______?
---Since three years ago.
A. open B. be open
C. been open D. been opened
It’s a secret. You _____ tell anyone about it.
A. mustn’t B. must C. can D. needn’t
I didn’t hear you because I ____ a shower at that moment.
A. have taken B. will take
B. C. was taking D. am talking
It _____five months since I came to America.
A. was B. is C. will be D. had been
