The test not only helps make our _____ acquired knowledge permanent, but also enables us to find out what needs to take more time to improve.
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.