He failed in the exam not only his laziness but also he didn’t listen to the teacher.
| A．because; for | B．because of; because |
| C．as; for | D．for; since |
Had they known what was coming next, they _________second thoughts.
| A．may have | B．could have |
| C．must have had | D．might have had |
Studying Tom’s menu, I found that many of the items are similar to ________ of McDonald’s.
| A．those | B．ones |
| C．any | D．all |
People who do not smoke have less ______of suffering from lung cancer than those who do so.
| A．potential | B．pattern |
| C．preference | D．prejudice |
This factory produced much dirty water, which resulted in a wide _______ of environmental problems.
| A．branch | B．range |
| C．species | D．wave |
Please tell me how the accident _______. I am still in the dark.
| A．came up | B．came out |
| C．came to | D．came about |