However, it is not possible for humans ______ some of the sounds.
A. hear B. listen C. to hear D. to listen
You won’t be healthy ________ you eat less sugar and exercise more.
A. unless B. when C. after D. if
Little Emma ______ speak any English yet because she is only five months old.
A. can’t B. mustn’t C. can D. must
If you do one thing at a time and stick to your plan, you ______ successful.
A. be B. are C. will be D. were
– I ______ my homework at nine last night. How about you?
– I was watching TV. I finished my homework early.
A. am doing B. will do
C. have done D. was doing
– Do you want to go to Fragrant Hills Park this weekend?
– No, I don’t. I ______ there twice this year.
A. went B. will go
C. was going D. have been
