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

What’s your opioion ? —-My opinions are ___.

to be the best one in the group, she had anopportunity to enter for the final competition.

What a nice watch! It must be expensive.—Not at all. You can only fifty yuan on it.

Who will youto do it? —fits for the position.