—I have a toothache.—You should _______.A. drink lots of waterB. take a restC. see a dentist
—_______have you known each other? —Since we were in our childhood.
—I felt _____ last night and then I fell _____ quickly. — I think you need more rest.
We should tell hunters _______tigers.
The big trees __________ some shade __________ us.
—________? —It was sunny.