单项选择题

-- I'm not sure ______ Mr Wang goes to see his parents.
-- Twice a week.

A．how long
B．how often
C．how soon
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单项选择题
-- Can you go shopping with us this afternoon -- Sorry, I cant. I （）take care of my little sister because she is ill.

A．have to
B．may
C．would
单项选择题
Today, the forests have almost gone. People must ______ down too many trees.
A．stop from cutting
B．be stopped to cut
C．be stopped from cutting
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