Where should you begin your research on complex and serious topics？（）

The fire quickly spread to（A）the first floor where（B）it...

问答题

The fire quickly spread to（A）the first floor where（B）it destroyed（C）all the equipments（D）in the language lab.

The reason（A）Tom has made great progress（B）is for（C）she...

问答题

The reason（A）Tom has made great progress（B）is for（C）she has never wasted（D）her time.

I am going（A）to have my letter type（B）tomorrow if Ive g...

问答题

I am going（A）to have my letter type（B）tomorrow if I've got（C）everything ready（D）by then.