They would __if food was difficult to find, so they celebrated when they had food.

It took him a long time to ______ the skills he needed to become an artist.

The couple decided to _____ another two children who lost their parents in the disaster.

Dark glasses are sometimes worn to ________ the eyes from strong sunlight .

The teacher apologized        late．

________ along the Silk Road led to world-wide business 2,000 years ago.

You should ____ your own knowledge to solve these problems.

It is said that the book _________ many events that can’t be found in other books.

The doctor said this new medicine would ________him of his cough last week .

---Do you mind my smoking here?
---I’m afraid I do. People _________ not to smoke in the reading room.