In our daily life, there are a lot of troubles we can avoid___________ our life easier and more comfortable.
| A．making | B．to make | C．make | D．made |
It is so wet there _____ the trees are extremely tall, some measuring over 90 meters.
| A．what | B．which | C．that | D．why |
Many _______ of years later, the first extremely small plants began to appear on the surface of the water.
| A．millions | B．million | C．million of | D．millions of |
_______ Jane’s way of studying chimps, our group are all going to visit them in the forest.
| A．Follow | B．Following | C．Followed | D．To follow |
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
Many of them have ______ gift for riding wild horse and can win thousands of dollars in prize.
| A．/ | B．an | C．a | D．the |