Tom helped the teacher to hand out the test papers, didn’t he ?

Sam is a very good man. He always tries __________ best to help others.

Nobody can finish the work in an hour ______ me. [ ]

McDonald’s restaurants _________ in Crimea(克里米亚) by the companyon Apr 4th, 2014.

Will you please help me to repair the computer now?—Sorry. I’m too busy and I haven’t a minute to __________.