The price of vegetables is now much _____ than ten years ago.

下列各句中，没有语病的一句是（ ）

We are lucky to be among the generation of people who have ______ and experienced the great social changes in our country.

Teenagers have all kinds of dreams. ,many students want to go to the moon some day.

The knowledge that I had caused him to lose his job made me bitterly ______.