1 . After half a month’ fighting, the Chinese team won 15 medals ________ at 2022 Beijing Olympic Winter Games. The athletes’ efforts have paid off.

A．on time

B．in the end

C．by accident

2 . —Do you know that many things are invented ________?
—Yes, for example, potato chips were invented in this way.

A．on sale

B．by accident

C．in public

3 . —Recently the war between Russia and Ukraine is getting serious!
—Yes, indeed. I thought a lot about it. ________, it reminds us that we should value the peaceful environment we have today.

A．In total

B．By accident

C．For example

4 . 那个男孩的成功不是偶然的。
The boy’s success didn’t come ____________.

5 . Betty 最终去了她梦想的大学，但这不是偶然地，而是她多年努力的结果。
Betty finally went to her dream university, but it didn’t happen ________. Instead, it was the result of her hard work for many years.

6 . 在回家的路上我偶然发现了一个钱包。
On my way home, I found a wallet ___________________________.

7 . was, by accident, tea, invented
__________________________________________________________.

8 . Which invention was invented ________ accident?

A．on

B．by

C．at

9 . —You look very happy. What happened?
—I met my first English teacher ________ in the street. I haven’t seen her for eight years.

A．in public

B．by mistake

C．by accident

10 . by accident, you, tea, did, invented, was, know
___________________________________________________?