If you take the evening classes at the International House of English, you'll pay about ______.

A．offers free sightseeing and social activities
B．has a special course in spoken English
C．costs less than the other schools
D．has native English teachers

A．very convenient to use in a lot of places
B．cheap enough for everyone to get one
C．small enough to put into one's pocket
D．easy to take to and from classrooms