A. It’s B. These are

C. Those are D. They’re

A. at B. in C. on D. to

A. my B. me C. mine D. I

—She volunteers there once a week ________ the kids learn to read.

A. helping B. to help C. helped D. to helping

—It’s $9.

A. What color B. How many

C. What price D. How much

A. in the, in the B. in, in the

C. in the, in D. in, in

【题目】The engineer ______ my father works is about 50 years old.
A.to whom
B.on whom
C.with which
D.with whom

A. flight; took off B. fly; took off C. flies; takes off D. flight; takes off

A. the B. a C. an D.\

A. number B. color C. map D. pen