The only existing problem is ____ we can find this special wood in the forest in such a short time.
Don't press the red button ,_______you will set off the alarm.
- Will you be available at three o'clock tomorrow afternoon? - No. I ______ a lecture then.
My own handwriting style is different from _______of my friends.
Would you like some more coffee?
________energy, we turn off the lights for Earth Hour on the last Saturday in March