The car salesman took the customer for a driver in the new model in order to _____ its improved features.
| A．advocate | B．demonstrate | C．exhibit | D．reveal |
_____ to the party, Joan was greatly hurt.
| A．Having not been invited. | B．Having not invited |
| C．Not having been invited | D．Not having invited |
________we went to visit Professor Smith, he________his research work.
| A．The first time; devoted to | B．Whenever; was concentrate on |
| C．For the first time; was busy with | D．Each time; was absorbed in |
A true gentleman is always _______ with himself and tolerant with others.
| A．strict | B．cautious | C．enthusiastic | D．positive |
—What about the student in your class, Mr. Wang?
—The doctor said that ________ sleep caused him poor memory and poor concentration.
| A．lacking of | B．lacked in | C．lacking | D．lack for |
____________ many times, but he still couldn’t understand it.
| A．Though he had been told | B．Having been told |
| C．Having told | D．He had been told |