Wind power is an ancient source of energy ______ we may return in the near future.
| A．from which | B．to which | C．on which | D．by which |
The producer comes regularly to collect the cameras _____ to our shop for quality problems.
| A．returning | B．returned |
| C．to return | D．to be returned |
He is full of _____ about his sick mother.
| A．concern | B．blame |
| C．delight | D．comment |
It’s quite hot today. Do you feel like _____ for a swim?
| A．to go | B．going |
| C．go | D．having gone |
-- Hi, let’s go skating.
--- Sorry, I’m busy right now. I_____ in an application form for a new job.
| A．fill | B．have filled |
| C．am filling | D．will fill |
Never_____ till tomorrow what you can do today.
| A．put away | B．put on |
| C．put off | D．put aside |