I think he has tried his best to improve his handwriting, ?
| A．don’t I | B．do I |
| C．hasn’t he | D．has he |
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 |
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 |