Find the mistake in each sentence below

I.Find the mistake in each sentence below
1.He will (A) clean (B) his house at 9 a.m (C) tomorrow (D).
2.Every day I go to work (A) by foot (B), but she drives (C) to (D) work.
3.There are (A) more opportunities (B) to find jobs (C) in Hong Kong as in (D) Bangkok.