A qualified doctor has to constantly update his knowledge in order to maintain his professional _____.
| A．conscience | B．competence | C．conservation | D．convenience |
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 |
--Excuse me, sir, _______________
--I’d like a cup of coffee and two pieces of bread.
| A．what do you want? | B．may I have your order? |
| C．this table is reserved. | D．I would like to serve you. |
Most people are familiar with the idea that all matter in the universe ________ atoms.
| A．makes up | B．makes up of |
| C．consists in | D．consists of |