单项选择题

Fest-food restaurants are ______ to those who are too busy or too tired to cook dinner for the family.

A. great helps
B. a great help
C. great help
D. of a great help
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I hope all the precautions against air pollution, ______ are suggested by the local government, will be seriously considered here.
A. as
B. while
C. after
D. since
单项选择题
The ______ were obliged to sweep away the tree ______ from the ______.
A. serfs.., leaves.., roofs
B. serves.., leafs.., roofs
C. serfs.., leaves.., moves
D. serfs.., leaves.., roofs
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