Some blood types are quite common，others are regionally______，and still others are rare everywhere.
| A．distributed | B．contributed | C．obtained | D．convinced |
Don't forget ______ the light when you leave the office.
| A．switching over | B．to turn on |
| C．to switch on | D．to switch off |
You'd better not ______ your coat, or you'll get cold.
| A．put on | B．get off |
| C．go off | D．have off |
The man was tired of the ______ speech and went out of the room.
| A．boring | B．bored |
| C．interesting | D．interested |
It is on September 1ststudents go back to school every year.
| A．when | B．who | C．that | D．what |
---It’s a long time since I saw our junior English teacher.
--- her this weekend?
| A．Why not visit | B．Why not to visit |
| C．Why not visiting | D．Why don’t visit |