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1. My father / start / work / engineer / this factory / 2015.
A. My father has started work as an engineer in this factory since 2015.
B. My father started working as an engineer in this factory in 2015.
C. My father had started working engineer for this factory by 2015.
D. So far / man send / satellites / space / reasons.
A. So far man has sent a number of satellites into space for many reasons.
B. So far man has sent a lot of satellites into the space under reasons.
C. So far man are sending different satellites in space from many reasons.
3. You / cold / you / put / warm clothes.
A. You'll catch cold when you put up warm clothes.
B. You won't get a cold if you put in warm clothes.
C. You won't catch cold by putting off warm clothes.
D. You'll get a cold unless you put on warm clothes.

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4. Linda came to the show late. She could see the main part of the show.
A. The late could see main part on the show because she came late.
B. Despite coming to the show late, but Linda could see its main part.
C. Although Linda came to the show late, she could see its main part.
D. If Linda didn't come to the show late, she could see its main part.
A. He knew how to prepare for a presentation if he was confident.
B. While he isn’t confident, he’ll know how to prepare for a presentation.
C. If he were confident, he could know how to prepare for a presentation.
D. He wasn’t confident, so he didn’t know how to prepare for a presentation.