Many people agree that __________ knowledge of English is a must in _____ international trade today.
| A．the, an | B．a, / | C．the, the | D．/, the |
I delayed _______ your letter because I had been away for a week.
| A．answer | B．answering | C．writing | D．to post |
---Will the Smiths go abroad this summer?
---No, they finally decided _______.
| A．to | B．not going | C．not to | D．not to be going |
The patient was warned _______oily food after the operation.
| A．to eat not | B．eating not | C．not to eat | D．not eating |
Charles Babbage is generally considered _______the first computer.
| A．to invent | B．inventing | C．to have invented | D．having invented |
The matter had better _______ as it is.
| A．leave | B．being left | C．leaving | D．be left |