1. Red tape
- I realized that there is a lot of red tape in this company. We need some changes here. (Correct)

2. rough day
- It was quite a rough day to solve all the issues occured the other day. I don't want it to happen again.

It was quite a rough day trying to solve all the issues that occurred yesterday. I certainly don't want to deal with that again. 

3. cover for
- Don't cover it for him this time. He should figure out what's the problem by himself.

Don't cover for him this time. He needs to figure out the problem by himself