Judgingfrom his worriedface,weknew that he______have had some trouble.
— 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.