May I use your bike—_____

I called you at 5:00 yesterday afternoon, but no one answered.—Sorry. I _______ football with my friends at that time.

Gun control is the subject ________ Americans have argued for a long time.

We would not __________ such hard work. It’s impossible for us to complete it in such a short time.

Lucy, read this book I____ that you’ll befond of it.—OK. I’ll read it after I have finished my homework.