123. At present nanotechnology(纳米技术), a kind of tip science_________to the common people. Few people know him.
----- That is how you can get to the hotel. Have I made myself clear? ----- I’m afraid I don’t quite catch with you.----- OK. __________
Some students have trouble _______grammar while others have difficulty —___ new words.
We were going out for a walk ________ it began to rain.
— What did Tina say just now?— She asked ____ this summer holiday.
Bill’s fully ____ from his heart disease. He is very happy.