Insert suitable adverbs as directed in the brackets:- 1) all the cards crumble when he blew hard (adverb of place)

All the cards crumble around when he blew hard.

Explanation:

An adverb is a word that modifies or tells us more about a verb. And an adverb of place tells us where the action is done. In other words, we can say an adverb of place tells us where the verb occurs.

In the given sentence, the main verb is "crumble" and the noun is "all the cards". Therefore, the adverb of place for the given blank is "around".

Thus, the final sentence will be

All the cards crumble around when he blew hard.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).