33．The highway through the rain forest was completed in 1990, _________some animal species have died off.
| A．by when | B．since then | C．since when | D．by which time |
---Mary’s score on the test is the highest in her class.
---Really? She ______ have studied very hard.
| A．may | B．ought to | C．must | D．should |
George, the lonely tortoise, was said ________ on a tiny island of Pinta in 1971．
| A．to have discovered | B．to have been discovered |
| C．having discovered | D．having been discovered |
______ left before the deadline, it doesn’t seem likely that John will finish the job.
| A．Though such a short time | B．With such a short time |
| C．Because such a short time | D．At such a short time |
— Would you please tell us something about the Group of Eight?
— Well, the G8 is an international organization ______ the richest countries of the world.
| A．making up of | B．consisted of | C．consisting of | D．made of |
______ is no doubt ______ he can win this match this time.
A．Th ere; that |
B．There; whether | C．It; that | D．It; whether |