Student or Learner
The following sentences are taken from one of China's provinces's 2007 college entrance examination paper. I feel they don't sound very natural but I'm not quite sure:
1. He has made a lot of films, but few good ones. (Would '...but not many are good ones' sound better?)
2. The new group of students is better behaved than the other group who stayed here. (Is 'are' better than 'is' for this sentence?)
3. --It was really very kind of you to give me a lift home.
--Oh, don't mention it. I was coming past your house anyway.
Collins says 'don't mention it' sounds old-fashioned. Do you native
speakers use it a lot nowadays?
Could I ask native speakers to help me please? Thank you in advance.