I'm tired out. I（）all afternoon and I don't seem to have finished anything.

单项选择题Let's learn to use the problem we are facing（）a stepping-stone to future success.

A. to
B. for
C. as
D. by

单项选择题Experts think that（）recently discovered painting may be（）Picasso.

A.the；不填
B.a；the
C.a；不填
D.the；a

单项选择题—I'm sorry I didn't make it to your party last night. —（）. I know you're busy these days.

A. Of course
B. No kidding
C. That's all right
D. Don't mention it

单项选择题The small village is said（）in a battle during World War 11.

A. to have been destroyed
B. to be destroyed
C. to destroyed
D. to have destroyed

单项选择题Tim is in good shape physically（）he doesn't get much exercise.

A. if
B. even though
C. unless
D. as long as

单项选择题Listening to loud music at rock concerts caused hearing loss in some teenagers.（）

A. is
B. are
C. has
D. have

单项选择题He regretted（）too much time on computer game.

A. to cost
B. costing
C. to spend
D. spending

单项选择题It was the doctor's carelessness that（）the serious accident.

A. resulted from
B. resulted in
C. brought up
D. brought in