Voices were _____ as the argument between the two motorists became more bad-tempered.
13. –Just now I called home but nobody answered. --Oh, sorry. I ________.
12. Mr Black has two sons, ________ are fond of collecting stamps.
11. “Do you prefer ________ rather than ________ by bus?” asked my mother.
10. My brother was born on January, 10th, 1990 ________ it was snowing heavily.
9. “Do you have any questions ________ clear to you?” the teacher asked.