I / have / toothache / so / I / have to / see / dentist.

A. Calories are important for human health.

B. Calories is important for human health.

C. Calories are important with human health.

D. Calories is important with human health

A. You can eat less, but you can do more exercise.

B. You can eat less, or you can do more exercise.

A. I have stomach ache, so I don't want to eat anything.

B. I have stomach ache, or I don't want to eat anything.

A. My cousin, Trang is very fat, but she is too lazy to walk.

B. My cousin, Trang is very fat, or she is too lazy to walk.

A. more     

B. less

C. little     

D. no

A. eat     

B. to eat

C. eating     

D. eats

A. My mother eats a lot of fruit and vegetables, so she does exercise every morning.

B. My mother eats a lot of fruit and vegetables, and she does exercise every morning.