His ideas are________and I suggest you think twice before you accept them[ ]

Many people make a / an ______that the housing price will remain high or even go up.—No wonder some queue up day and nightfor an order.

How often do you go swimmng –__________. I can’t swim at all.

she is not so cheerful she used to be?

下列各句中，加点的成语使用恰当的一句是 （ ）