Safety comes first. Which is right?
① When you are alone at home, open the door as soon as someone knocks at the door.
②Pay attention to the gas, water and electricity.
③Walk across the street when the traffic lights turn green.
④Don’t mention our private matters when we meet a stranger.
⑤Always meet the persons who you know on the Internet.
A.②③④ B.①②⑤ C.①③⑤
People in western countries will get together to eat turkeys and celebrate harvest（丰收）on ________, just like our Mid-Autumn Day.
A.Thanksgiving Day B.Christmas Day C.National Day
—Why did you look so tired these days?
— I’ve been too busy ________ for the Entrance Exam to high school.
A.to prepare B.preparing C.with prepare
—What is she busy doing?
— She is doing with the machine that she had ________ two weeks ago.
A.repaired B.it repaired C.it to repair
—I have to regret ________ that you won’t be accepted to the university.
— I see. I really regret________most of my time playing computer games instead of working hard.
A.to say, to spend B.saying, to spend C.to say, spending
—Did you remember ________ in class?
—Yes, he told us that the sun________bigger than the earth.
A.what did the teacher say, is
B.what the teacher said, is
C.what the teacher said, was
