请教您英语测验中的错题,在线等您的帮助,谢谢了,急!

请教您英语测验中的错题,在线等您的帮助,谢谢了,急!
请教您考试中的错题,一定要解释为什么这样做.不要单纯答案,万分感谢!
1.--Don’t speak too loud .Your little brother_________in the bedroom
‍
--I’m sorry.I didn’t know.
A sleeps B slept C is sleeping D has slept
2.________train on the right isn’t ________D train
A A ,an B The ,an C The a D The ,the
3.We go up and down ____________
A in the life B in life C by the life D take a life
4._______you sure you bought the T-shirt in your size?
A Did B Have C Do D Are
5.My parents are planning a _________trip to Thailand
A two weeks B two-- weeks C two-- week D two week
6A man _________as George Washington will give us a performance.
A dress up B dressing up C dressed up D dress