If _____ carefully, the experiment will be successful.
| A．do | B．does | C．done | D．doing |
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 |
Everybody sits and waits in the shade of the trees while the family begins to wake up and ______.
| A．move off | B．move on | C．move out | D．move in |