He gave me some advice about ___________.
A. how get there B. how to get there C. how getting there
Turn off the water while you ________ your teeth or washing your hands.
| A．were brushing | B．brush |
| C．are brushing | D．brushed |
It ________ about eight minutes for sunlight (阳光) to travel from the sun to the earth.
| A．takes | B．spends |
| C．costs | D．pays |
Talk to your teacher and you will get help ________ you have a problem.
| A．unless | B．if |
| C．until | D．so |
We have friends to help us fight against pollution, and trees are one of ________.
| A．themselves | B．they |
| C．their | D．them |
Now, people regard drinking tea ________ a culture more than a habit.
| A．as | B．by | C．of | D．with |