As there is less and less coal and oil, scientists are exploring new ways of making use of ____ energy, such as sunlight, wind and water for power and fuel.
| A．original | B．alternative | C．convenient | D．staple |
—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 |
_________a reply, he decided to write a sixth letter.
| A．Not receiving | B．Not to receive |
| C．Not having received | D．Having not received |