Interesting tongue-twisters like these?
The second one you have, could even be

雨天骑自行车，车轮打滑，还好我反应快，一把把把把住了！


You have to be the champion to be honored this prize.


这个奖品，想获得得得到第一名。


According to Carbon Carbon bond energy, could we negate theorem one or theorem two?


根据碳碳键键能能否否定定理一或定理二？


I almost missed the shuttle to Shanghai if I were walking too slowly.


多亏跑了两步，差点没上上上上海的车。


If you poison a venomous snake with poison, would it be poisoned to death?


用毒毒毒蛇毒蛇会不会被毒毒死？

I got this one even better.

Ming Ming does know Bai Bai is wasting time having a crush on him, but he would not say.


明明明明明白白白白白喜欢他，但他就是不说。


A granny from Netherlands drinks six bottle of durian milk in Rio de Janeiro.


里约热内卢的荷兰老奶奶喝了六个榴莲牛奶。

You could find more from this link.
Ok, now get ready for this one, you have to be good in ancient Chinese to read the following

石室诗士施氏，嗜狮，誓食十狮。施氏时时适市视狮。十时，适十狮适市。是时，适施氏适市。氏视是十狮，恃矢势，使十狮逝世。氏拾是十狮尸，适石室。石室湿，氏使侍拭石室。石室拭，氏始实食是十狮。食时，始识是十狮，实十石狮尸。试释是事。

There are more of these here.