China has many special forms of traditional art, ______ sky lanterns, paper cutting and Chinese clay art.

The manager didn’t turn up ______ Peter agreed to sign the contract.[ ]

We only live once, but if we live a wonderful life, once is enough.— ________ I agree.

The waiter was asked to welcome guests with a ________ smile and a bow.

下列各句中，加横线的成语使用恰当的一句是（ ）