He is a dark horse.

• silent
• secretive
• dangerous
• possessing a secret ability.
Correct Option: D  [ possessing a secret ability. ]

Remark:

To be fair and square

• worthy
• honest
• successful
• obedient
Correct Option: B  [ honest ]

Remark:

All our effort ended in smoke.

• to come to nothing
• to gain importance
• to praise oneself
• to reach target
Correct Option: A  [ to come to nothing ]

Remark: ended in smoke: means to fail or be unsuccessful after a lot of effort.

His promotion is on the cards.

• due
• evident
• certain
• probable
Correct Option: C  [ certain ]

Remark:

'At daggers drawn' means:

• friendly
• on bad terms with
• acquainted
• unknown
Correct Option: B  [ on bad terms with ]

Remark:

His ghost story was beyond belief.

• Fantastic
• Terrifying
• Incredible
• Imaginary
Correct Option: C  [ Incredible ]

Remark:

The boy took to his heels after stealing some money.

• jumped up
• hurt himself
• ran away
• fell down
Correct Option: C  [ ran away ]

Remark:

On hearing the news of the kidnapping, she became afraid of her own shadow.

• cold and distant
• afraid of her own safety
• very nervous and easily frightened
• afraid of being alone
Correct Option: C  [ very nervous and easily frightened ]

Remark:

She just needs forty winks in order to be able to work all night.

• someone's help
• to take a stroll
• a short nap
• a little cooperation
Correct Option: C  [ a short nap ]

Remark:

The meeting ended in fiasco.

• succeeded
• in confusion
• in complete failure
• in acrimonious debate
Correct Option: C  [ in complete failure ]

Remark: