The light will be thrown ______ the cause of cancer by research that is now in progress.
My suggestion is that he _________to see a doctor at once.
Helen had to shout ________above the sound of the music.
I don’t know ______ tomorrow. Can you tell me?
A large number of students in our school ____ from the countryside; the number _____ growing these years.
According to the present economical ______, it is important to safeguard the regional growth and stability.