It is well-known that such a thing must ________ happening again.
—Are these buses? —Yes, A. it isB .they areC. these are.
—Thank you very much. — A. That’s OK.B. Good bye.C. Thanks.
— are you? —I’m thirteen years old. A. whoB. whereC. How old
—火警电话是 。 A.one one zero B. one one nine C. one two zero
— Lucy a wide mouth? —No, she doesn’t. A. Do. hasB. Does,haveC. do,have