【推荐1】I found Lisa's bag on the playground ________ accident. I picked it up and returned it to her.

A．for

B．with

C．of

D．by

【推荐2】—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

【推荐3】—The umbrella in your hand is my brother’s.
—Oh, I’m so sorry. I took it ________. The color is the same as mine.

A．by the end

B．by accident

C．by mistake

D．by the way

【推荐2】—Why was Mr. Wilson so angry with Peter?
—Because Peter broke the window ________. It wasn’t an accident.

A．on purpose

B．by chance

C．at once

【推荐3】We didn’t plan to meet. We meet ________ in the street.

A．by the way

B．by chance

C．on purpose

D．in surprise

【推荐1】—Your jacket feels so nice, what’s it made ________?
—Silk, and it is also made ________ hand.

A．from; in

B．of; with

C．from; on

D．of; by

【推荐2】Now things made by machine are cheaper than those made ________ hand.

A．by

B．at

C．in

D．for

【推荐3】In the past, people washed clothes              .

A．by hand

B．with hand

C．by hands

【推荐1】The woman took my bag ________ mistake.

A．for

B．at

C．of

D．by

【推荐2】If people help animals sincerely (真诚地), animals will help us ________.

A．on show

B．in return

C．by mistake

【推荐3】I took Tony’s cap ________ mistake.

A．by

B．for

C．in

D．at