—Mum, I'm tired.—Well, if you ________ go to bed after midnight every night, what do you expect?
______ is even more important is that the earth cooled down, water began to appear on its surface.
Jane _____ these families of chimps for many years and helped people understand how much they behave like humans.
It is so wet there _____ the trees are extremely tall, some measuring over 90 meters.
Many _______ of years later, the first extremely small plants began to appear on the surface of the water.
_______ Jane’s way of studying chimps, our group are all going to visit them in the forest.