A． aren't
B． isn't
C． hadn't
D． haven't

A． will take
B． must take
C． took
D． shall take

A． What we need at the moment is trucks, bulldozers and drill
B． Half of the students has signed up for the new course—Public Relation
C． The number of DINKs seems to be increasing in big citie
D． John as well as I wants to go boatin