I am all at sea.

• out of reach
• very happy
• puzzled
• drowning
Correct Option: C  [ puzzled ]

Remark:

To bite the dust

• eat voraciously
• have nothing to eat
• eat roots
• to fail
Correct Option: D  [ to fail ]

Remark:

thought his skill would match up to Kashav’s bulk, but in the fight he was beaten neck and crop.

• softly
• completely
• swiftly
• profoundly
Correct Option: B  [ completely ]

Remark:

To murder in "cold blood", it means to murder:

• coolly
• unfeelingly
• thoughtlessly
• deliberately
Correct Option: B  [ unfeelingly ]

Remark:

There is no gainsaying the fact that the country is in difficulties.

• ignoring
• hiding
• forgetting
• denying
Correct Option: D  [ denying ]

Remark:

At first there was a show of resistance to the new rule issued by the Government, but the movement had no backbone and speedily collapsed.

• justification
• impact
• strength
• support
Correct Option: C  [ strength ]

Remark:

A damp squib

• rainy weather
• a disappointing result
• a skirt in a laundry
• Great honour
Correct Option: B  [ a disappointing result ]

Remark:

The representatives of the two states tried to enforce a treaty which was a dead letter.

• not well-thought out
• no longer in force
• no longer relevant
• not in keeping with the changing times.
Correct Option: B  [ no longer in force ]

Remark:

To be fair and square

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

Remark:

If you talking about a "tit for tat" situation, you are:

• making someone angry
• doing harm as done to you
• rewarding people for the good done
• taking advantage of someone
Correct Option: B  [ doing harm as done to you ]

Remark: "tit for tat": is an equivalent given in return, retaliation in kind.