HSK3 汉字 (41-45)

万
二十岁了，还没结婚了。万分危急！
20 years old and not yet married. This is critical!

二十岁了，还没结婚，很着急!

Do you really think this is extremely emergent or critical or dangerous? Otherwise it's not appropriate to use 万分危急 here. 危急 includes 2 meanings, namely dangerous/critical and hurry/must be soon.

据
据说她很漂亮而且很丰富 。
It is said she is very beautiful and very rich.

据说她很漂亮而且很富有／有钱／阔
You can translate 'rich' as 富有

安
这条街道很安静。
This street is very quiet.

Wonderful!

只
为了健康，他只好锻炼很多。
Due to his health, his only option is to exercise a lot.

为了健康，他唯一的选择就是大量锻炼。

If you really want to use 只 to compose, 为了健康，他只好选择大量锻炼。 option you can translate as 选择／选项。很多 is not appropriate here. Though 'a lot' generally can translate as 很多.

赛
这是在与时间赛跑！
It is a race against time!

Perfect!

HSK3 汉字 (41-45)

万
二十岁了，还没结婚，很危险， 
20 years old and not yet married. This is critical!

据
据说她很漂亮而且很富有。
It is said she is very beautiful and very rich.

安
这条街道很安静。
This street is very quiet.

只
为了健康，他只好多锻炼
Due to his health, his only option is to exercise a lot.

赛
这是在与时间赛跑！
It is a race against time!