9. During the teacher’s absence, the class was very noisy.
While _________________________________________________________________________
10. The builder is going to mend my roof tomorrow.
I ____________________________________________________________________________
11. I am sorry I sent you that letter. It was very rude of me.
I regret _______________________________________________________________________
13. He is so dull that people fall asleep while he is talking.
He is such _____________________________________________________________________
14. My English friend finds using chopsticks difficult.
My English friend isn't ..........................................................................................................................
15. That car's so expensive, I don’t think I can buy it.
It's such ...................................................................................................................................................