He has devoted most of his time and energy _______ a cure for the disease.
It rained continuously for seven days, completely ___________ our holiday.
John is very ____________ — if he promises to do something he’ll do it.
When he opened the box, it ____________ a bad smell.
Having lived in China for 8 years, Helen has a good ____________ of both English and Chinese.
We had a big meal in afinerestaurant last Monday andthetotal cost ____________ $500.