When ________ questions in class, one should answer them as clearly as possible.
| A．asking | B．to ask | C．to be asked | D．asked |
Though ______money ,his parents managed to send him to a key university.
| A．lacked | B．lacking of |
| C．lacking | D．lacked in |
— Who should be responsible for the accident?
— The boss, not the workers. They just carried out the order ______.
| A．as they told | B．as are told |
| C．as told | D．as telling |
Sorry to say I’m busy now and can’t help ______ the lab.
| A．to tidy | B．tidying |
| C．being tidy | D．but tidy |
It is widely believed that smoking _________lung cancer.
| A．contributes to | B．turns to |
| C．objects to | D．points to |
New iPhone went on sale on Friday with ________ bigger screen and 4G wireless technology, as ________ company seeks to keep its competitiveness(竞争力).
| A．a ; a | B．a ; the |
| C．the ; the | D．the ; a |