He_____notpayunlessheispunishedtopay.

what do you think of the job of being a nurse—In my opinion, it ____ be difficult sometimes though it seems easy.

As a child, Johnson would sit on thesteps alone, _______ the sun ______ down.

下列句子中没有语病的一项是（ ）

When the children are busy playing their games．They had better be _____