Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.

Have you ever stopped _____ how our lie _____ if the world ran out of ol?

. His mind _____, little tom missed the point.

He spoke English so well _____ by us all.

 _____ him speak English so fluently, and you would think him an American.

There is a crowd of people in front of the house over there. What do you suppose

_____ there?

I don’t like _____ speaking ill of each other.

The electricity ____, the light went out.  

The subjects we have at school _____biology.

 One of the methods of introducing foreign genes into a plant is to make use of certain

soil bacteria to infect the plant and transfer several of blue genes to the infected plant

cells, _____ in high rate of plant cell pision.