Without facts, we cannot form a worthwhile opinion for we need to have a factual knowledge ________ our thinking.

I like sleeping with the windows open _______ it rains.

English is very important for me . So I practice _______ it over and over again every day .

What is the correct structure of the sentence “Driving brings the young man happiness”

We all feel it is Jack as well as his wifethat 　　　　for their son’s bad performance at school.