-Mary, would you like to come to my birthday party?
-_____.
| A．Of course, you could | B．Sure. Go ahead |
| C．Sorry, you may not | D．No, you mustn’t |
When you are out for food, you'd better stay _______in the cave in case the enemy might find you.
| A．to hide |
| B．hiding |
| C．hidden |
| D．for hiding |
Your cousin is said________a new computer programme recently，but do you know when he will finish it?
| A．to design |
| B．to be designing |
| C．to have been designing |
| D．to have designed |
8．The average Facebook user in the United States has 245 friends，according to a study______in February.
| A．publishing |
| B．published |
| C．publish |
| D．to publish |
________her mother after being separated for 20 years，she couldn't help，even though she tried not to，________.
| A．Seen；crying |
| B．To see；cry |
| C．Seeing；crying |
| D．Having seen；cry |
—What in the world put you in a really bad mood?
—________in the traffic for hours.
| A．Stuck |
| B．Being stuck |
| C．To be stuck |
| D．Sticking |