—It is ridiculous (荒唐的) that so many people believe the world will disappear in 2012.—__________ it is true?
The couple decided to _____ another two children who lost their parents in the disaster.
Being too about your food is not good for your health.
Tom has _____ good knowledge of English and this will improve his chance of finding _____ proper job.
In many countries, some scientists are already _______ research in order to produce a cloned human baby.
Edward, you play so well, but I you played the piano.