Tomorrow I'm flying to Beijing．I there for the following three weeks．（ ）
| A． |
am |
B． |
have been |
C． |
will be |
D． |
was |
---Show me your homework, Dave.
----Sorry, Mrs Brown. I’ve_____it at home.
| A．missed | B．forgotten |
| C．lost | D．left |
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 |