Ex 14. Mark the letter A. B. C. or D to indicate the underlined part that needs correction 1. (A) I will leave the party early (B) because (C) I must (D) studying for my exam. 2. 1 (A) stayed up (B)late last night because I (C) mustn't go to school (D) on Sunday. 3. We (A) ought to not play football (B) as (C) it's raining (D) outside. 4. You (A) mustn't (B) to drive a car (C) if you (D) don't have a driving licence.
