The store had to a number of clerks because sales were down.
| A．lay out | B．lay off | C．lay aside | D．lay down |
Laura was away in Paris for over a week.When she got home，there was a pile of mail ________for her.
| A．waited | B．to wait |
| C．waiting | D．was waiting |
The room is empty except for a bookshelf ________ in one corner.
| A．standing | B．to stand |
| C．stands | D．stood |
In some languages,100 words make up half of all words ________ in daily conversations.
| A．using | B．to use |
| C．having used | D．used |
Volunteering gives you a chance________lives，including your own.
| A．change | B．changing |
| C．changed | D．to change |
________which university to attend，the girl asked her teacher for advice.
| A．Not knowing | B．Knowing not |
| C．Not known | D．Known not |