1. It's not a/an digital watch. It's got hands.
2. If you play this stereo on maximum volume, you'll go deaf!
3. It's not a/an complicated experiment. In fact, it's really simple.
4. Are leather chairs more comfortable than plastic ones?
5. There aren't any windows in the lab, so all the light is artificial.
6. Was it a/an sudden decision, or had you thought about it for a long time?
7. The lights are automatic - they come on when you enter the room, and go off when you leave.
8. Each person's fingerprints are unique. No two people have the same fingerprints.
9. The minimum number of patients necessary to test the new drug is 50. Any less than that and the scientists won't know if it works properly or not.
10. I can't remember the exact year it was discovered, but it was around 1976.

có thể viết theo cách khác : 
1. It's not a/an digital watch. It's got hands.
2. If you play this stereo on maximum volume, you'll go deaf!
3. It's not a/an complicated experiment. In fact, it's straightforward.
4. Are leather chairs more comfortable than plastic ones?
5. There aren't any windows in the lab, so all the light is artificial.
6. Was it a/an sudden decision, or had you thought about it for a long time?
7. The lights are automatic - they come on when you enter the room, and go off when you leave.
8. Each person's fingerprints are unique. No two people have the same fingerprints.
9. The minimum number of patients to test the new drug is 50. Any less than that and the scientists won't know if it works properly or not.
10. I can't remember when it was discovered, but it was around 1976.