—Aren't you Mary's sister
—（）. I'm her aunt.

单项选择题My little sister is so tired, she can hardly walk,（）

A. does she
B. can she
C. doesn't she
D. can't she

单项选择题（）Yellow River is the second longest river in our country.

A. /
B. The
C. An
D. A

单项选择题It（）us two hours walk to get to our school.

A. take
B. takes
C. spend
D. paid

单项选择题Tell the students ______ their English books.

单项选择题One of the boys is ______, all the other boys are ______.