Teachers required that all the students ___ their homework all alone.
| A．must finish | B． would finish | C．had to finish | D．finish |
_______his thoughts, the scientist didn’t notice what had happened before him.
| A．Absorbed in | B．Caught in |
| C．Used to | D．Interested in |
The professor could tell by the _________look in Mars's eyes that she didn’t understand a single word of his lecture.
| A．cold | B．blank |
| C．fresh | D．innocent |
If the sun ________ in the west tomorrow, Helen _________ Tom!
| A．were to rise, would marry | B．were to rise, will marry |
| C．rises, would marry | D．rises, will marry |
Having a trip abroad is certainly good for the old couple, but it remains_________ whether they will enjoy it.
| A．to see | B．to be seen |
| C．seeing | D．seen |
___________, and you’ll know which one is good.
| A．Compared with these two ones |
| B．Comparing this one with that one |
| C．Compare this one with that one |
| D．Compared to this one with that one |