Clothing made of man-made materials has advantage over ____ made of natural ones like cotton, wool or silk.
7.Although the causes of cancer ____, we do not yet have any practical way to prevent it.
6.I have to go to work by taxi because my car ____at the garage.
5.---Have you handed in your schoolwork yet? ---Yes,I have. I guess it ____ now.
4.It is said that the early European playing-cards ____ for entertainment and education.
3.As the years passed, many occasions--- birthdays, awards, graduations ____ with Dad’s flowers.