— I phoned you at six last night, but （）answered.
—I （）a walk in the park at that time.

单项选择题Depending on the outcome of negotiations, Caspian Air （）offer flights to Berlin and Copenhagen from Kova Airport.

A. be
B. has
C. did
D. may

单项选择题（）number of students have gone to Shanghai.

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

单项选择题Billboards, graffiti, trash, and tangled telephone wires can （）to visual pollution.

A. contribute
B. contribution
C. contributive
D. contributable

单项选择题（）school is much larger than （）.

A. Our; your
B. Our; yours
C. Ours; yours
D. We; you

单项选择题Fair Oaks Transit trains were back on schedule Monday after a mudslide disrupted last Friday morning's （）.

A. section
B. commute
C. tracking
D. beginning