Are these sentences right? 1. My parents are growing old. -- Yes, correct, natural, idiomatic. 2. The environment in China is growing worse. -- Yes, correct, natural, idiomatic. 3. People grow weaker because of age. --Yes. The use of "grow" is correct. It would sound more natural to say "People grow weaker WITH age." 4. The house prices are growing higher and higher. -- Doesn't sound right to me. It's grammatical, it's understandable, but I would not use "growing." I would use the word "climbing." And "The house prices" isn't right here. These would be correct: House prices are climbing higher and higher. -- OK Housing prices are climbing higher and higher. -- Better, more formal The prices of houses are climbing higher and higher. -- Here's where you could use "The." Prices of house are climbing higher and higher. -- But this is OK, too.

个人觉得都对。只是多注意不要犯中式英语的错误就好了