Answer: B) The Red River is shorter than the Mekong River.
Explanation for this question is being written.
Answer: B) My mobile phone is older than my computer.
Answer: B) Is newer than the market.
Answer: D) The older I get, the less I want to travel.
Answer: A) Her new house is not as big as her old house.
Answer: D) Many people are dishonest these days.
Answer: A) Apples are more expensive than oranges.
Answer: C) Is better than the food here.