Twenty-five percent of the water in this river _____ dirty in the past.A. is B are C. was D. were
- I'm worried about my English. -_______ harder, _______ you will catch up with your classmates.
-_______, Judy. Let's go to the cinema! - I'm sorry I can't go with you. I have a lot of homework to do.
He has poor eyesight _ too much computer work at night.
- Don't keep water running when you wash hands. -_______.
-________ is your height? -180 cm.