| Since Tom _____ downloaded a virus into his computer, he can not open the file now. |
A. readily B. horribly C. accidentally D. irregularly |
| The traditional view is _____ we sleep because our brain is "programmed" to make us do so. |
A. when B. why C. whether D. that |
| Small sailboats can easily turn over in the water _____ they are not managed carefully. |
A. though B. before C. until D. if |
| Pop music is such an important part of society _____ it has even influenced our language. |
A. as B. that C. which D. where |
| The little boy came riding full speed down the motorway on his bicycle. _____ it was! |
A. What a dangerous scene B. What dangerous a scene C. How a dangerous scene D. How dangerous the scene |
| With the help of high technology, more and more new substances _____ in the past years. |
A. discovered B. have discovered C. had been discovered D. have been discovered |
| The open-air celebration has been put off _____ the bad weather. |
A. in case of B. in spite of C. instead of D. because of |
| Alan is a careful driver, but he drives _____ of my friends. |
A. more carefully B. the most carefully C. less carefully D. the least carefully |
| The mayor has offered a reward of $5000 to _____ who can capture the tiger alive or dead. |
A. both B. others C. anyone D. another |
| Leaves are found on all kinds of trees, but they differ greatly _____ size and shape. |
A. on B. from C. by D. in |