–- Excuse me, would you mind answering a few questions?--- Well, I don’t know. I’m in a hurry _______.

Mr.Brown ___ goes to bed before midnight.

As is known to all language learners, newly learnt words will soon be forgotten unless ______ used in everyday communication.

Our bodies are strengthened by taking exercises. ____, our minds are developed by learning.

Twenty million years ago, Idoho was not the dry place as it is now. ______, it was warm and damp, covered with thick forests.