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A. Doing some research. B. Writing a paper. C. Studying for a test.

【題目】The bikes driven by electricityin color, size and shape.
A.vary　　
B.diverse　　
C.transform　
D.differs

【題目】The engineers are so busy that they have zero time for outdoor sports activities, ______ they have the interest.
A.wherever
B.whenever
C.even if
D.as if

—He had to give up his drawing, not because he wanted ________ that way but because he had to be.

A. this B. one

C. it D. such

A. At home. B. At his office. C. On the way home.

A. If B. Since

C. Until D. Unless

A. The man. B. Angelina. C. Miranda.

A. picked up B. came up C. turned up D. took up

【題目】We ___________ our success with beer.
A.proposed
B.toasted
C.held
D.congratulated

A. was until， when B. was until that

C. wasn’t until， when D. wasn’t until， that