This is my English teacher. name is Mr. Brown.
The WHO has given some advice on to prevent us being infected(感染)with H7N9.
When the parents arrived at the hall, the students _______ their projects.
Tom Sawyer let his friends _______ a long fence by playing a trick one afternoon.
There are three English-books on the shelf, but ______ of them is mine.
The manager asked him if he ________for the extra work the next weekend.