The project is based on an agreement, one of ________ purposes is to ensure that the project can be accomplished before the deadline.

d you find your trip to America,John—_________．

Why do you look sotired ? —-_______I am writing a reportfor the newspaper.

Is there a supermarket around _____ I canbuy some Christmas gifts

stars from the entertainment industry, such as Ke Zhendong and Fang zuming, have recently been arrested, which shows that drug taking is becoming _____ increasingly serious threat to society.