— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear! She ______ a lot of difficulties!
| A．may go through | B．might go through |
C．ought to have gone through | D．must have gone through |
——The captain did not leave the sinking ship till the last moment.
——So he was the last man ______ the ship.
| A．left | B．leaving | C．to leave | D．to be leaving |
The factory used 65 percent of the raw materials, the rest of which _____ saved for the other purpose.
| A．is | B．are | C．was | D．were |
--- The report is difficult to write.
--- You can surf the internet, where you can find _____ information and useful expressions.
| A．a lot | B．a good many | C．plenty of | D．a large number of |
The tourist industry has _______ a great number of different jobs.
| A．invented | B．developed | C．discovered | D．created |
There was no ______ that she was a good teacher.
| A．reason | B．fact | C．doubt | D．wonder |