I suggested to my father that we ____________ to Dalian for a holiday this summer, but the expression on his face suggested that he ___________ to it.

With her eyesthe work attentively, she didn’t know what was happening outside.

0% of the students at that school _____ thehabit of smoking, which is beyond imagination.

I find ____ useful _____ English well.

It is wise of you towell trained workers for untrained ones in your workshop. A．substitute B．changeC．exchange D．employ