Where is my pen? I _____ it.

A. might lose 　 　　 B. would have lost

C. should have lost 　 D. must have lost

_____ the program, they have to stay there for another two weeks.

A. Not completing　　　　　　　　 B. Not completed

C. Not having completed　　　　　 D. Having not completed

Put this photo in one of the ______.

We ________ him the house for $ 20,000.

A. supplied　 B. offered　 C. paid　 D. cost

The operator put him ______ to 83428091.

A. out　 B. in　 C. through　 D. on

In order to make up for the lost time, they are working like c________.

The disease _______（传播）easily.

By the year she arrives in London, scientists probably ____ a cure for bird flue.
A. will be discovering     B. are discovering
C. will have discovered    D. have discovered

The manager，knowing his factory's products were poor in ________，decided to give his workers further training.

A．quantity 　　　　　 B．amount

C．deal　　 　　　　　　 D．quality

The old man needs a ___________stick _________more steadily.

A. to walk,　 to walk B. walking, walking C. walking, to walk D), to walk, walking