We had warned him（) the danger but he turned a deaf ear to our warning.A inB outC ofD on

We will ______ special attention to the dangerous cargo.

When he realized the police had spotted him, ？

It’s high time we ______ him a regestered letter.A. sendB. sentC. has sentD. had sent

All______is to give him a warning.A．what is neededB．is neededC．that is neededD．the needed

We did not know what had come______ him to make him change his mind so abruptly.A．onB．toC．

What will social scientists do in the years ahead?A.Warn people of the danger to live in s