____ good use you’ve made of your time to study, there’s still room for improvement.

--- The MP3 cost me about 2,000 yuan.
--- Well, it was crazy of you to spend so much money_____you could buy a cheaper one.

---You don’t look quite yourself today. What’s the matter?
---Well, I’ve caught a cold. Nothing serious, ________.

The children ran away from the orchard(果園)________ they saw the guard.

–It’s a long time ___ I last saw you.
--Yes, and it will be two months ______ we can meet again.

_______ the paintings of da Vinci, the Louvre Museum has more than 6,000 other European paintings, _______ from the 13^th century to the 19^th century.

_______ you want me to fire you, I suggest you not wear sports clothes in the office next time.

—I like your new shoes!
—Thanks．I had to try on almost a dozen pairs ______ I decided to get them．

The customs office is     your luggage is inspected when you enter or leave a country.

      I’m concerned, the computer you want is not very expensive and you can afford it.