1 . The world has been changing at such a high speed            no one has expected.

A．which

B．that

C．and

D．as

2 .         is strongly recommended is that we should never trust such people        always over-praise you to your face.

A．It; which

B．As; that

C．What; as

D．It; who

3 . Stress is everywhere and in fact it isn't such a bad thing ________ it is often supposed to be.

A．that

B．as

C．what

D．which