---- I wonder ______ Mr. Black changed his mind to take part in the movement.---- After he listened to the speech by Mr. King.
There are many insects in the world that never do _______ harm to human beings.
_____ it is _____ you obtain, you should share _____ your parents your feelings.
A greenhouse is a building _______ of glass _______ for keeping plants warm when the outside temperature is low..
She is the only one of the persons ________ from the mistakes.
About _______ gene-targeting drugs are already in testing pipeline. It won’t be long ______ they are put into effect.