Giúp mình với!!! Mọi người làm thì có thể giải thích cho mình được không???

Exercise 3: 1. My (A) mother still spends (B) 14 hours a day (C) do (D) the housework 2. She asked why (A) did Mathew look (B) so embarrassed (C) when he saw (D) Carole. 3. The girl whom about (A) we are talking (B) used to be (C) a Miss World (D) 4. Newtonian physics accounts (A) from ...