补全对话。

A:  __1__ your favourite food?

B:  My favourite food is candy.

A:  __2__  it __3__ food?

B: __4__ ,  it isn't.  It is __5__ food.

A:  What's your favourite __6__ ?

B:  My favourite drink is juice.

A:  That's good.  It is a __7__ drink.

B:  Yes.  It is good for our health.

A: __8__  you __9__ __10__ juice here?

B:  Sorry,  I haven't got any juice here.

缩聚过程中，反应体系表现为粘度逐渐增大，而且当反应进行到一定程度后，粘度急剧增加，体系转变成凝胶状物质，这一现象称为（），出现凝胶现象时的临界反应程度称为（）。