A. sing B. to sing

C. singing D. sings.

【题目】—How old ____________ your cat?
—I think ____________ one.
A.is, it
B.are, it's
C.is, it's
D.are; is

A. Whether B. If C. Though D. While

【题目】There are ____________ months in a year.
A.twelve
B.twenty
C.twelfth
D.twentieth

【题目】September is ____________ month of the year.
A.nineth
B.ninth
C.the ninth
D.nine

-- It's under your bed.

A. what B. which

C. when D. where

A. bottle of milk B. bottle of milks

C. bottles of milk D. bottles of milks

【题目】Jack's birthday is April 11.

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

【题目】The baby is _____.
A.ten month old
B.ten months old
C.ten month's old
D.ten-year-old

A. advice B. advices

C. suggestion D. suggestions