Peter ______ be really difficult at times even though he’s a nice person in general.

. The movie was totally a waste of time. I ______ just as well have stayed at home.

I really don’t know how to express my thanks to Mr. Li, my high school English teacher, without whose help I__________ to college that year.

(2013·高考天津卷)If he had spent more time practising speaking English before，he________ able to speak it much better now.

 It was playing computer games that cost the boy plenty of time he ____ doing his lessons.