Fill in the Blanks

'Went at' means 'attacked'. This meaning fits in the framework of the meaning of the sentence.

'Held over' means 'postponed'. This meaning fits in the framework of the meaning of the sentence.

'Brought out' means 'introduced'. This meaning fits in the framework of the meaning of the sentence.

'Flown off' means 'departed'. This meaning fits in the framework of the meaning of the sentence.

'Do over' means 'do something again'. This meaning fits in the framework of the meaning of the sentence.

'Draws in' means 'entices'. This meaning fits in the framework of the meaning of the sentence.

'Call on' means 'ask someone for an answer in the class'. This meaning fits in the framework of the meaning of the sentence.

'Flung down' means ruined'. This meaning fits in the framework of the meaning of the sentence,

'Pertinent to' means 'having some connection with the matter at hand; relevant; to the point'.  

Some verbs like 'separate', 'depart', 'dissociate', etc are always followed by preposition 'from'.

Reverberate means 'to cause (a sound) to reecho, to reflect (light, etc.), to deflect (heat, flame, etc.), as in a reverberatory furnace'. 'Reverberate from' is the correct prepositional usage.  

"Only" follows 'but' only. 'And' can not be used as a contrary idea has been presented.

'Unless' is the correct conjunction to make the sentence meaningful. It means 'If you do not practice hard, you will not be selected...'

No contrary or opposing idea has been presented here. So, 'and' is the correct conjunction to join the sentence here.

"And yet" is the correct choice because it is describing the result of an action. 'But" and "yet' cannot be used together as they have similar meaning and are used independent of each other.