Keep off the drugs（毒品）,         you and your family will be in great danger?

    A. and      B. or     C. but      D. so

Remember       off the lights when you leave the classroom.

take off ,    on time ,    take place ,    turn off ,    thanks to ,    rather than
【小题1】             my teacher's help, I worked out the problem at last.
【小题2】We should think about others first,            ourselves.
【小题3】Can you            the radio？ I'm writing my homework.
【小题4】Great changes have           since I left my hometown 10 years ago.
【小题5】I hope you can come to the meeting            tomorrow.