1 . —Sorry, Jack. I took your notebook _________.
—It doesn’t matter.

A．by mistake	B．by accident
C．by hand	D．for mistake

2 . —I met our old friend Jenny in the street            this morning. What a surprise!
—Really? You must have talked a lot.

A．by hand

B．by mistake

C．by accident

3 . —In my opinion, not all inventions were invented by ________ accident.
—Well, you do seem to have ________ point, inventing needs much time and hard work.

A．An; a

B．an; the

C．/; a

4 . My classmate is very careless, and he always takes my school things ________.

A．by accident

B．by mistake

C．without doubt

5 . I met my best friend __________ at the railway station yesterday.（偶然）

6 . —How do you know Lily’s phone number?
—I met her ________ on the street yesterday, and she told me about it.

A．in surprise

B．in public

C．by accident

D．in silence

7 . 茶是被偶然发明的。（汉译英）
_____________________________________________________

8 . — Sorry, Dan. I took your notebook ________.
—It doesn’t matter. They look the same as each other.

A．by accident

B．by mistake

C．in trouble

D．in danger

9 . Success in life doesn’t happen ________. It requires hard work and perseverance (毅力).

A．by accident

B．by mistake

C．by the way

D．by hand

10 . I can’t find my English book. Maybe someone took it ________.

A．by mistake

B．at present

C．by accident

D．in general