His experiences as a volunteer in the quake-hit areas have changed his attitude toward society and _______ influence his future life．

-- Hi, Samantha! When did you arrive in Leeds?
--- Last week, I ___________ a different culture since then.

I graduated from college twenty years ago and I ____________ as an English teacher in this middle school ever since.

The train arrives in Liverpool at 10 p.m. tonight . The plane I would like to take from there _______by then.

The milk must be preserved at this temperature until it ____.

The way of life he was used to _______ when he came to study in America.

—Look ,I’ve got admission to Harvard University for a short-term study next semester.
—How fantastic! You _____a different university Life then.
A. have experienced                     B. will be experiencing
C_ have been experiencing               D. will have experienced

—Car prices have been going down sharply in the last 20 years.
—It’s not surprising because the law of market _____the price of a product

---I'm trying to find yesterday's newspaper. Have you seen it?
---I'm afraid that I ________ it away. I thought you had finished reading it.

Although the causes of cancer_____, we do not yet have any practical way to prevent it.