The stronger the ______ is, the more quickly a person will learn a foreign language. That is to say, it is up to whether he has an interest in the foreign language.
I couldn’t move my legs. It was ______ they were stuck to the floor.
Can you tell me the name of the school ______ you visited last week?
The doctor ______ a cure for the disease .
You really don't know what we ______ while we were working on this project .
Father went to his doctor for ______ about his heart trouble .