Although there are no classes in the afternoon now, no student ______ go out of school without the head teacher’s permission.
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.
Jane warns us that our group is going to be very tired and dirty by the afternoon and she is right. However, the evening makes it all ______. A. favorable B. worthwhileC. precious D essential