Could you tell me ______ there?
| A．when the first bus will arrive at |
| B．when would the first bus arrive |
| C．when the first bus arrived at |
| D．when the first bus arrives |
While listening in class, you should concentrate ____ your teacher.
| A．at | B．to | C．for | D．on |
Schools don’t allow ______ answers in the exam.
| A．copy | B．to copy |
| C．copying | D．copied |
Thomas Edison is known _____inventions______ a great inventor.
| A．to, as | B．for , as |
| C．as, to | D．to, for |
An accident______ on this road last week.
| A．has been happened | B．was happened |
| C．is happened | D．happened |
Tom is often made ______for twelve hours a day by the boss.
| A．work | B．working |
| C．to work | D．to be working |