The Australian boy has a good ________ of Chinese and can express himself freely in it.

Dr. Stockton was much ____ by his colleagues for his research in astronomy. 

The kitchen is often the busiest room in a household, so it’s important to make sure it      well.

Sean's strong love for his country is ___ in his recently published poems.

— My computer _______ start, no matter how hard I try.— It might have crashed.