So sudden_____ that the enemy had no time to escape．
| A．did the attack | B．the attack did |
| C．was the attack | D．the attack was |
The library needs ______,but it’ll have to wait until Sunday.
| A．cleaning | B．be cleaned | C．clean | D．being cleaned |
—What do you think of the book?
—Oh , excellent. It’s worth ______a second time.
| A．to read | B．to be read | C．reading | D．being read |
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 |