Kathy told me that all the doors and windows _______ when she arrived this morning.

The scientist decided to ______his eyes to those whoneed them after his death.

Mr Smith spoke slowly and clearly to________all of us students could follow him.

You look quite tired. You’d better ______ agood rest.

I tried ________ it out in this way, but I failed (失败)．—Why not ______ it in some other ways