—What made you so tired?
—__________ driving all day.
| A．Practiced |
| B．To practice |
| C．Practicing |
| D．Practice |
Taobao.com has begun selling tickets online for international flights, ______ to cut the market share of Ctrip.com and other competitors.
| A．to aim | B．having aimed | C．aiming | D．being aimed |
Employers often give jobs to _______ they believe has work experience and a stong sense of duty.
| A．whoever | B．whomever | C．who | D．whom |
Standing on the top of the hill, one would not do anything, but _____ the flowing of the clouds around me.
| A．enjoy | B．enjoying | C．enjoyed | D．to enjoy |
The “magical apple”, which we wish not to be the last one_____ us, has inspired the imagination and passion of millions of people.
| A．fascinate | B．fascinating | C．fascinated | D．to fascinate |
Why the explosion occurred was ____ the laboratory attendant had been careless.
| A．for | B．because | C．since | D．that |