1. In China, New Year celebrations last for/at/over 15 days.
2. Oranges and mandarins are symbols about/for/of luck and wealth.
3. Tina served the chicken in/with/on potatoes.
4. Most cheese are rich with/of/in calcium.

Linda ___ (had been trying) to find a present for her mum for over an hour before she ___ (finally saw) something nice to buy her.
William ___ (had already heard) the news when I ___ (called) to tell him.
While Emma ___ (was doing) her homework, her brother ___ (was playing) music loudly, and she couldn't concentrate.
Nathan ___ (came) across a photo of his great-grandfather as he ___ (was looking) through some old things.
Helen ___ (is) exhausted because she ___ (has been jogging) for two hours.

1. The students (are working) very well this term.
2. Have you (heard) the news? Tom and Ann are engaged!
3. Do you (hear) the wind? It is blowing) very strongly.
4. Have you (seen) my car keys anywhere? – No, I (am looking) for them but I (do not see) them.
5. Have you (seen) my bag anywhere? I (have been looking) for it for ages.
6. I have never (read) a story that (interested) me so much as the one I (read) last night.
7. When we (went) to see them last night, they (were playing) chess, they (said) they (had been playing) since six o'clock.
8. You (will go) with us to the Zoo tomorrow if you (are) a good boy.
9. No sooner had we (finished) the translation of the text than the bell (rang).
14. She is always (borrowing) from me and never (remembers) to pay me back.