It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．
| A．when; which | B．when; that | C．that; which | D．that; that |
Tom is a stubborn and careful man; It took many hours to_______ him of my good idea and to give up his.
| A．ask | B．convince | C．remind | D．accuse |
The patient was warned _______ oily food after the operation.
| A．to eat not | B．eating not | C．not to eat | D．not eating |
The monitor wanted to buy two_______ stamps, but the salesgirl only sold him_______ these stamps.
| A．scores of; dozens of | B．scores; dozen of |
| C．score of; dozen of | D．score of; dozen |
I spent most of my money in the first week and________ had very little to eat by the end of the holiday.
| A．besides | B．however | C．consequently | D．frequently |
He gets fifty thousand pounds a year ______I get twenty million, which makes me upset.
| A．since | B．while | C．when | D．as |