There was ______ time _____ Chinese used foreign oil.
---What’s the matter with Christine?---A letter from her parents in California_____an attack of home sickness.
After the quarrel, I tried all my best to fix the misunderstanding between us, but all my efforts seemed _____.
Failure hurts grown-ups and children_____, but it can make a positive contribution to your life once you learn to use it.
If the food tastes nice, I’ll go to buy some more; _____, I won’t go.
The silence of the library is sometimes broken by a sudden cough or the sound of pages_____.