Fill in the blanks with the appropriate verb 
 :
 1. The boys were playing games when it _______________ raining.
 a. was starting b. started c. had started
 2. The phone __________________ while I was cooking dinner.
 a. Rings b. rang c. was ringing
 3. How long _______________ a social activist?
 a. Have you been b. are you c. were you
 4. We _____________ each other for a long time.
 a. Knew b. are knowing c. have known
 5. We _______________ nothing from the wars in history.
 a. Learnt b. have learnt c. learning
 6. The teacher ___________________ an interesting question in the class yesterday.
 a. Asks b. has asked c. asked
 7. I looked around, but I ________________ anyone.
 a. Didn’t find b. hadn’t found c. don’t find
 8. If you don’t hurry, you ________________ the train.
 a. Will miss b. would miss c. missed