By the time you arrive, I ______ working for two hours

By the time you arrive, I ________ working for two hours．

听力原文：M: Can you work for me tomorrow from 1:30 P.m. to 5:00 P.m.? You see, I have a meeting and I need someone, to fill in hose hours for me.W: I don't know if I can. I have an appointment tomorrow at 3:00 P.m. I really can't cancel it either. I can work about an hour for you, though, if that'll help.Q: Why does the man want the woman to work for him?(14)

It is（）for people to work shorter hours

Why did the man wait in the heat for two hours?

The SART should have sufficient battery capacity to operate in the stand-by condition for（）hours and should continuously work for（）hours.

The （）should be kept running for about half an hour after FWE.

Bill can inspect a case of cell phones in 6 hours. Jack can inspect the same case of cell Phones in 4 hours. After working alone for l hour, Bill stops for lunch. After taking a 30-minute lunch break. Bill and Jack work together to inspect the remaining cell phones. How long do Bill and Jack work together to complete the job?

I have worked with him for some time and have found that he is_____than John.

I’m afraid I’ll spend _____ two hours on the problem.( )

I’ve worked ______ four hours on this article. I’m completely ______.

After walking hurriedly for half an hour, I wanted to drink （）