(单选题)40: In discussing environmental pollution we ought to keep ____ the point of concern. A: to B: at C: on D: off ...

(单选题)28: Twenty years ago it was common to see people _________ from hunger on the streets in that poor nation, but clearly the situation has improved greatly since then. A: calling B: preventing C: resulting D: collapsing ...

(单选题)48: The line was engaged and the operator asked if I’d like to ____. A: hang about B: hang back C: hang on D: hang out ...

(单选题)24: I got a little ________ when I learned that the appointment with the general manager was changed to another time. A: concerned B: distracted C: upset D: awful ...

(单选题)18: Mary could not tell Jane the secret with her little brother standing ____. A: by B: up C: in D: to ...

(单选题)46: After Jackson ______ for an hour, he came to the conclusion that Mrs. Bonnie was not coming. A: waited B: was waiting C: has waited D: had been waiting ...

(单选题)34: With tears on her face, the old lady watched the little boy _____ to a hospital. A: send B: to do sent C: being sent D: sending ...

(单选题)4: ______ he worked very hard all day, he couldn’t finish the job in time. A: Although B: Even C: In spite D: In case ...

(单选题)30: Nothing can _____________ the friendship we have shared all these years. A: be equal to B: be as equal as C: equal to D: equal ...

(单选题)34: You should have been more patient ______ that customer；I'm sure that selling him the watch was a possibility. A: of B: with C: for D: at ...