–When did the earthquake of Ya’an happen?
–It happened _______ April 20, 2013.
| A．at | B．in | C．on | D．to |
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 |
The manager asked him if he ________for the extra work the next weekend.
| A．had come | B．will come | C．would come | D．came |