The policy of the mainland is very clear and straightforward,and the key problem is _____the leaders of Taiwan will accept it.
— I must apologize for _____ ahead of time. — That’s all right.
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.