1 . — I met an old friend of mine ________ on my way to work today. We hadn’t seen each other for twenty years!
— How amazing it is! Nothing exciting can’t happen.

A．right away

B．by accident

C．for sure

D．in fact

2 . Not until the police began to look into(调查) the accident did he tell me ________ what was on that afternoon.

A．by mistake

B．by accident

C．in person

D．in total

3 . —I’m sorry,sir. I took your umbrella _______.
—Never mind.

A．by the time

B．by the way

C．by accident

D．by mistake

4 . —Sorry, I broke your glass by _________ accident.
—Never mind. I can buy _________ in the nearby supermarket.

A．an; it

B．/; it

C．/; one

D．an; one

5 . —Where is my bike? I put it here just now.
—Don't worry. Maybe somebody rode it away _________ .

A．by the end	B．by the way
C．by accident	D．by mistake

6 . “Bump” means “Hit someone or something _________ accident”.

A．in	B．on
C．by	D．at

7 . Tea was invented by _______ accident.

A．an

B．the

C．＼

8 . —Sorry, Jane.I took your schoolbag _____.
—It doesn’t matter.

A．by mistake	B．by mistakes
C．by accident	D．by accidents

9 . The red handbag is mine. You took it away ____________.

A．by accident

B．by the way

C．by mistake

10 . — The twin sisters look the same.
— I think so. Even their parents call them ____________.

A．by mistake

B．by accident

C．by the way

D．by the time