This sentence is difficult to understand.Can you make of it?

ing to the recent regulation,it is required that any chemical plant that_______ along the river _______ tobuild a recycling center for the waste

How long ________ you _______ the book — For only a week.

We have different opinions on many things, so we often ▲ with each other.

It was not until the beginning of the meeting _____ he realized _____ I told him was the only possible way to deal with the problem.