in case: 万一，如果
Bring your own soap, shampoo and towel just in case.
为了以防万一，可以带上你自己的肥皂、洗发剂和毛巾。
In case I missed something?
以防我漏掉什么呢?

without strings: 无附带条件
They offered medical aid without strings attached.
他们无条件地提供医药援助。
If a person seeks not to receive love, but rather to give it without strings attached, he will become lovable and he will most certainly be loved by others in the end.
如果一个人无条件的给予他人关爱，而不是寻求得到他人的爱，那么他将受人们的喜爱，并且最终肯定会得到他人的爱。

hold to: 坚持
If your values serve you, hold to them.
如果你的价值适合你，那就坚持你的价值。
If you hold to my teaching, you are really my disciples.
你们若常常遵守我的道，就真是我的门徒。