_____ he is very young, _____ he knows a lot.
A. Though, / B. Though, but C. Not only, but also
Chinese students often give small gifts or cards to their teachers on Teachers’ day to let them know _____.
A.how great they are
B.how great are they
C.what great they are
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