Those students sent_______ books to a village school on Children's Day.
| A．three thousands | B．thousands of |
| C．thousand of | D．three thousands of |
---I called you at 4:00 yesterday afternoon, but nobody answered.
---Sorry, I ______ with my friends at that time.
| A．had swum | B．swam |
| C．would swim | D．was swimming |
The WHO has given some advice onto prevent us being infected(感染)with H7N9.
| A．how | B．what | C．where | D．when |
When the parents arrived at the hall, the students _______ their projects.
| A．have finish | B．had finished |
| C．finished | D．are finishing |
Tom Sawyer let his friends _______ a long fence by playing a trick one afternoon.
| A．paint | B．to paint | C．painting | D．to painting |
There are three English-books on the shelf, but ______ of them is mine.
| A．both | B．neither | C．all | D．none |