They had _____8-day holiday during this National holidays, but some of them felt unhappy because of _____heavy traffic on the highways.

A. an, the  　       B. a, the 　　　        C. a, a 　　　  D. an, a

____ UFO landed on Center Park and ______ alien got out of _______ UFO. 

A. An; an; the      B. A; an; the      C. A; a; a          D. A; an; a

There ’s __________“u” and __________“s” in __________  word “use”.

 –There is _______ interesting book on the teacher’s desk.

--Oh, ______ book is Wei Fang’s.

A. an; the           B. the; the           C. the; a             D. a; the