Not only________to turn off the lights in the kitchen,but we also failed to lock the front door.
_________matters most in learning English is enough practice.
In the factory women _______ 44% of the workforce , and nearly half the mothers with children are in paid work.
What you said just now______ me of that American professor.
The invention of the typewriter was a great_______ to communication and printing.
.He is a new comer in the team, but I have the______ that I have seen that man before.