It is the prevention of disease ______its successful treatment that has led to the rapid increase of the world’s population.
----Will you go to the party? ----Of course I will.
Generally speaking_______acording to the instructions,the drug has no side effect.
Is that a book on farming?_______,I want to borrow it.
Wherego to spend our summer vacation this year?
_____, Carolina couldn't get the door open.