By the time he was twelve, Edison __________ to make a living by himself.
| A．would begin | B．has begun |
| C．had begun | D．was begun |
.
Such animals like dinosaurs died out because they couldn’t ________to the change of the climate.
| A．suit | B．keep | C．adapt | D．switch |
.
Mary realized she .
| A．was playing a joke about | B．was making fun of |
| C．was being laughed at | D．was made fun |
.
You should remember the cause and avoid it the next time you __________ the same situation.
| A．come out | B．come about | C．come up | D．come across |
.
Easton, you will go to prison where you will have time to __________ your own activities which brought you there.
| A．reflect in | B．consider on | C．consider in | D．reflect on |
.
So before I go any further I want to thank you very much for inviting me to __________ this important conference.
| A．participate in | B．join to | C．take part | D．attend to |