6. Professor Smith and Professor Brown will _____ in giving the class lectures.
A. exchange B. alter C. shift D. alternate
7. Pack the cake in a strong box, or it might get _____ in the post.
A. splashed B. split C. crushed D. crashed
8. The thief _____ the papers all over the room while he was searching.
A. abandoned B. vanished C. scattered D. deserted
9. Today, housework has been made much easier by electrical _____.
A. facilities B. appliances C. instruments D. equipment
10. The _____ of the trees in the water was very clear.
A. mirror B. sight C. reflection D. shadow
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