While she is a lovely girl, she be extremely difficult to work with.
| A．may | B．must | C．should | D．can |
—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 |
To improve the quality of our products, we asked for advice had used the products.
| A．which | B．who | C．whichever | D．whoever |