______ a certain doubt among the people as to the practical value of the project.
| A．It has | B．They have |
C．It remains | D．There remains |
Little Jim should love _____to the theatre this evening.
| A．to be taken | B．to take | C．being taken | D．taking |
The squirrel was lucky that it just missed___________.
| A．catching | B．to be caught | C．being caught | D．to catch |
Charles Babbage is generally considered______-the first computer.
| A．to invent | B．inventing | C．to have invented | D．having invented |
_________a reply, he decided to write a sixth letter.
| A．Not receiving | B．Not to receive |
| C．Not having received | D．Having not received |
The secretary worked late into the night, ______a long speech for the president.
| A．to prepare | B．preparing | C．prepared | D．was preparing |