20. John shut everybody out of the kitchen _______ he could prepare his grand surprise for the party.
| A．which | B．when | C．so that | D．as if |
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 |
________ in the early 20th century，the school keeps on inspiring children’s love of art.
| A．To found | B．Founding |
| C．Founded | D．Having founded |