. _______ different kinds of pianos, the workers farther improved their quality.
Iraq has _______ too many wars since 1990s, making his people _______a lot.
Jim didn’t realize his little sister was crying _____ what he had said.
The number of the teacher invited _____ twelve, but a number of them ___ late for different reasons.
Young people spend most of their time _________, for they don’t want to stay at home all day.
Though money, his parents managed to send him to university.