Jack’s___ brother is __ than him.
| A．old; elder | B．elder; older | C．old; eld | D．elder; younger |
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 |
To master a foreign language,______.
| A．a lot of practice is needed | B．it needs a lot of practice |
| C．practice is in need of | D．one needs a lot of practice |
They have had a long and bitter struggle _____their living conditions.
| A．to improving | B．for improving | C．to improve | D．improve |