For weeks, the street hasn’t been cleaned by the cleaners, _______makes it very dirty.
I called Hannah many times yesterday evening, but I couldn't get through. Her brother ______ on the phone all the time.
The house rent is expensive. I’ve got about half the space I had at home and I’m paying _____here.
Medicine shouldn’t be kept where it is _____ to children.
He studied hard, _____ the exam.
-- What made her so upset? -- ______ she failed in her examination.