下列选项中，不属于当代中国法律渊源的是（)。A．判决书B．地方性法规C．规章D．国际惯例

A、You should speak as fast as possible.

B、You should speak in a formal way.

C、You should speak with some jokes.

D、You should speak more slowly than usual.

Section A

The more you practice oral English, the better you can speak it, and this is "practice makes perfect" means.

In those two years, Professor Brooks often had us _____ such oral presentations in class.

A.did

B.done

C.to do

D.do

If you want ______,you should speak slowly and clearly to the listeners.

A．to be understood

B．to understand it

C．understanding

D．to understood

If you want ______ , you should speak slowly and clearly to the listeners.

A．to be understood

B．to understand it

C．understanding

D．to understood