To achieve better health, it's important to reduce screen time during work.

C. To achieve better health, it's important to cut down on screen time during work.

(The phrase "cut down on" is synonymous with "reduce.")

The last time our children visited Disneyland was in 2022.

D. Our children haven't visited Disneyland since 2022.

(This is the closest meaning, as it indicates the last visit occurred in 2022 and hasn't happened again.)

This is the first time I have gone out for a picnic.

B. I have never gone out for a picnic before.

(This expresses the same idea, as it is the first time.)

He is too short to play basketball.

A. If he were not short, he could play basketball.

(This is a correct hypothetical structure based on the original sentence.)

My friend told me, "If I were you, I would not ask him for help."

A. My friend advised me not to ask him for help.

(This is a rephrasing of the advice given by the friend.)

I want to meet Nga, but I don't have her address.

A. If I had Nga's address, I would meet her.

(This is a correct hypothetical situation based on the original sentence.)

He drives more carefully than Jack does.

C. Jack doesn't drive as carefully as he does.

(This is the correct comparison, indicating that Jack's driving is less careful.)

No one has seen Linda since the day of the party.

A. Linda has not been seen since the day of the party.

(This maintains the meaning of not seeing Linda since that time.)

The last time I had a swim in the lake was ten years ago.

A. I haven't swum in the lake for 10 years.

(This is a rephrasing of the idea that the last swim was ten years ago.)

She goes to school late because she lives very far from school.

D. If she didn't live far from school, she wouldn't go to school late.

(This is the correct conditional sentence showing the cause and effect.)