—Don’t ______, my children. Keep working on and you will be successful.—Thank you. We’ll try our best.
Tom found _____ difficult to learn chemistry well. A.it B.that C its
Our English teacher said _____ English well was very important. A.learn B.learning C.learned
—Don’t throw stones at the animals in the zoo.—_____. A.No, I won’t. B.Yes, I will. C.Yes, I do.
The doctor warned my father _____. A.to smoke B.not smoking C.not to smoke
—My aunt goes to climb mountains every Sunday. —Oh? But she _____ hate exercising. A.used to B.was used to C.is used to