It would be unfair to clone any extinctanimalsthey were to live in azoo.

When did you buy your first pair of skates——_______________ .

The lesson drawn from the coal mine accidents is that safety measures are so important that we _____ take them too seriously.

下列各句中，加点的成语使用恰当的一项是(　　)

(2013·南昌三中模拟)—Do you think Jack will lend us a hand?—He is the last one to help others. He ________ lend his hand, though.