A plan has been put forward more graduates should go to work in the countryside this year.
| A．when | B．that | C．whether | D．how |
________ many times，I still didn't know how to operate the machine.
| A．Having taught | B．Having been taught | C．Being taught | D．Teaching |
Tony is said ________ to New York, and now he is studying medicine in a famous college in America.
| A．have gone | B．to have gone | C．going | D．to go |
Today the Red Cross provides a number of services for the public, such as helping people________, teaching first aid and providing blood.
| A．in need | B．in return | C．in preparation | D．in anger |
Everyone in the class is expected to________in the discussion.
| A．participate | B．attend | C．donate | D．declare |
Please post this letter in the post office nearby, and ______, I will get two tickets in the train station.
| A．in meantime | B．on the meanwhile | C．in meanwhile | D．in the meantime |