Ⅰ.单项选择(共20分，每小题1分)
( )1. You can find _______ “s” and _______ “u” in the word “bus”.
A. a, an B. an, an C. an, a D. the, a
( )2. —Are the sweaters yours? —Yes , _______.
A. it’s hers B. they’re theirs C. it’s ours. D. they’re ours.
( )3. ---________ does your brother go swimming? ---Once a week.
A. How long B. How often C. How soon D. How many
( )4. One computer is not enough for us. We need _______ one.
A. other B. another C. the other D. others Mrs.
