In the office an electrical engineer is looking through the instructions to know ________ the heat system works before the repair work.
| A．whether | B．why |
| C．how | D．that |
I arrived late; I ________ the road to be so icy.
| A．wouldn’t expect | B．haven’t expected |
| C．hadn’t expected | D．wasn’t expecting |
Some countries are increasing their use of natural gas, and other forms of ________.
| A．source | B．energy | C．power | D．material |
All the employees except the manager ________ to work online at home.
| A．encourages | B．encourage | C．is encouraged | D．are encouraged |
–Which share is meant for me?
--You can take ________ half. They’re exactly the same.
| A．this | B．any | C．each | D．either |
We don’t doubt ________ he can do a good job.
| A．whether | B．that | C．how | D．why |