Though ____ the dangers of smoking to their health, smokers still find it hard to give up smoking.
| A．aware | B．aware of | C．are aware of | D．be aware of |
Being too about your food is not good for your health.
| A．special | B．particular | C．worried | D．mean |
Tom has _____ good knowledge of English and this will improve his chance of finding _____ proper job.
| A．a; the | B．a; a | C．/; a | D．/; the |
In many countries, some scientists are already _______ research in order to produce a cloned human baby.
| A．putting up with | B．coming up with |
| C．putting forward | D．pushing ahead with |
Edward, you play so well, but I you played the piano.
| A．don’t know | B．hadn’t know | C．didn’t know | D．haven’t known |
People often have this belief ______ development is bad for the environment, but this does not have to be true.
| A．that | B．which | C．where | D．how |