'Had better' is followed by base form (no 'to'). 'Had better get' is correct.

The subordinate clause needs a main clause with subject. 'It should be stored' is correct.

'Get an idea across' = communicate it successfully or make it understood.

'Courteous' means polite and respectful. 'Gracious' is the best synonym.

'Every' makes the subject singular. Pronoun should be 'his or her' not 'their'.

'perfect' should be the adverb 'perfectly' to modify the verb 'diagnose'.

'by' must be followed by a gerund. 'watch' should be 'watching'.

Patron provides support. Counselor provides advice — same person:function relationship.

Heart is the vital power-providing part of a human. Engine is the vital part of a car.

Not hearing news suggests everything is okay — bad news usually travels fast.

Be content with what you have rather than risking it for something uncertain.

This rhetorical question expresses surprise or wonder — not seeking an actual answer.

Raising eyebrows is a facial expression showing surprise or disbelief.

'Sporadic' means occurring at irregular intervals or only in a few places. 'Scattered' is the best synonym.

'Omnipotent' means having unlimited power. 'Supreme' (highest power) is the closest synonym.

'Repeal' = to revoke a law. Opposite is 'enact' = to make a law official.

'Equity' means fairness and impartiality. Antonym 'bias' means prejudice or unfair inclination.

A 'eulogy' is a speech or writing that praises someone highly. An 'elegy' is a sad poem.

To 'shrug' is to raise one's shoulders to express doubt or indifference.

'Diplomatic' = able to deal with people in a sensitive and effective way.