—I have worked hard at math, but it seems that I haven’t made any progress.
—Keep on _____ at it, and you will be successful.
A. work B. working C. to work
—This physics problem is too difficult. Can you show me _____, Wang Li?
—Sure.
A. what to work it out B. what to work out it C. how to work it out
In the past, the workers _____ do a lot of hard work.
A. forced B. forced to C. were forced to
I’m afraid I have to _____ the doctor’s advice.
A. follow B. receive C. carry
—Hi, Jane, tell you a piece of good news. I _____ America tomorrow.
—Wow, have a good trip!
A. will leave to B. am leaving for C. going leaving for
I advise you ________ to make computers serve us better.
A. study B. to study hard C. studying hard
