It is difficult for any of us to eat better, exercise more, and sleep enough,________ we know we should.
| A．because | B．even if | C．unless | D．before |
Does the way you thought of _______ the water clean make any sense?
| A．making | B．to make |
| C．how to make | D．having made |
The old professor told us every part of the materials should be made use of ______ the power station.
| A．to build | B．building |
| C．build | D．built |
The boss insisted that every minute ______ made full use of ______ the work well.
| A．be, to do | B．was, doing |
| C．be, doing | D．was, to do |
Hearing the news, he rushed out, ______ the book ______ on the table and disappeared into the distance.
| A．left; lain open | B．leaving; lying open |
| C．leaving; lie opened | D．left; lay opened |
I got out of the taxi, _____ the fare and dashed into the station.
| A．paid | B．paying |
| C．to pay | D．having paid |