To dispose of a ton of trash in a landfill, customers have to pay a tipping fee of __________.

A．The man hates to lend his tools to other people.
B．The man hasn’ t finished working on the bookshelf.
C．The tools have already been returned to the woman.
D．The tools the man borrowed from the woman are missing.

A．The benefits of strong business competition.
B．A proposal to lower the cost of production.
C．Complaints about the expense of modernization.
D．Suggestions concerning new business strategies.