The bell rang and came in Mr.Brown, a book in his hand. Then the class began.
| A．for | B．when | C．with | D．while |
________ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
| A．Examining | B．Examined |
| C．Being examined | D．Having been examined |
We agreed to accept ________ they thought was the best professor in the college.
| A．whatever | B．whomever | C．whichever | D．whoever |
I don’t know who invented ________ telephone. It’s really ________ most useful invention.
| A．the; a | B．/; a | C．a; the | D．/; the |
In hot weather, an old tyre can break again easily it’s mended.
| A．when | B．where | C．which | D．that |
____ he grows up can he understand your intentions.
| A．Unless | B．Once | C．Only when | D．Ever since |