---What do you think of your parents? ---They always let me do ________ I think I should do.
She found her calculator _____ she lost it.
For breakfast, he only drinks juice from fresh fruit____ on his own farm.
Leaves are found on all kinds of trees,but they differ greatly_____ size and shape.
When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.
It____ Tom that parked the car here, as he is the only one with a car.