The government stops businessmen(商人)from providing teenagers ____ cigarettes (香烟).
--- Jim’s seldom been late for school, _____? ---______. But he got to school on time this morning..
—Have you ever ridden a horse? —No. I’d like to, _______.
.John is always praised _______ one of the top students ______ his efforts.
— Look, the man looks like Mr Green. — It ________ be him, for he ________ America since last week and hasn’t returned..
You mustn’t throw them about _________you use these plastic bags.