Such a grammar mistake is _____ among the beginners of English study.5.
.A ________may be given ____means of flags, lights, and guns.
Seeing the man on the bike with a boy at the front and the other at the back, the policeman signed _______stop.
Deaf people talk ________.
A dark cloud is a _______of rain.
Since advertising can increase sales of production, _____it can _____the price.