My little sister is so tired, she can hardly walk,（）……

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 ______.

单项选择题Mrs. Hu asked Liu Fang and ______ to take part in the English meeting.