I want to ________ the secrets of natureand apply them for the happiness of man

Parents ______ good conditions(条件) _______ us. We should be grateful（感激的）to them.

（题文）If we don’t ________ the problem, it will certainly grow.

Why don’t you watch some English movies? — Oh, it’s too ______ because the people speak too quickly. I can’t catch them at all.

Do you have difficulty getting along with the new colleagues?— No. I______ quickly.