Your father isn’t in. Where is he–He _________ Shanghai on business.

When we speak to people, we should be .

下列各句中，加点熟语的使用恰当的一句是

Wait until we get a satisfactory reply, will you? — I couldn’t agree_______ The idea sounds great to me[ ]

It seems that the aged people _________ the H7N9 moreeasily from the recent cases.