I ran across a car crash in Hong Kong, and ________, both sides just politely exchanged the telephone numbers and cards, a surprise to me.

－Will Daniel come to our gathering? (福建省)－______not,for he is much too busy with his research work. 

Our vacation was totally ruined. Not only was the food terrible,the weather was awful_____

It is difficult for children to change their eating habit later in life. _____，parents should encourage healthy eating from an early age.

A model or an experiment in a science class can help us see things which would       remain hidden．