---- She looks happy. She ________ have passed the exam.
---- I guess so. It’s not difficult after all.
| A．should | B．could | C．must | D．might |
Chemicals in the body ______our food _____ into useful things．
| A．break, into | B．break, up | C．break, down | D．break, off |
—Peter looked tired and a little absent-minded in class．
—He _____ too late．
| A．may stay up | B．could stay up |
| C．should have stayed up | D．must have stayed up |
She’s so ______ that no one can please her.
| A．particular | B．simple | C．normal | D．adventurous |
___________ ill worried my parents greatly.
| A．I fell | B．Me falling | C．My falling | D．I falling |
E-mail, as well as telephones, ______ an important part in daily communication.
| A．is playing | B．have played | C．are playing | D．play |