The newly­learnt words will be impressed on us only if they are ________used in everyday communication.

 How ______ is it from the railway station to the museum?

 The cousins are alike in age，but ________ they are as different as day and night.

He holds an important position in the company;_______, I don’t quite trust him.

---Fish need water to survive; _____ , we human beings rely on air to live.