Our knowledge about the infinite space is very limited. (Synonym)

• strange
• unknown
• vague
• endless
Correct Option: D  [ endless ]

Remark:

Expeditiously (Find Synonym)

• Rudely
• Gently
• Meekly
• Quickly
Correct Option: D  [ Quickly ]

Remark:

The tranquillity and sanctity of the place soothed us. (synonym)

• Security
• Holiness
• Equanimity
• Placidity
Correct Option: B  [ Holiness ]

Remark:

Menacingly (Find Synonym)

• Dangerously
• Threatening
• Harmfully
• Hideously
Correct Option: B  [ Threatening ]

Remark:

His devious nature was shown in half-lies and small dishonesties.

• showing a skillful use of underhand tactics to achieve goals
• being cruel to others
• being technologically competent
• having secret knowledge about the state of affairs
Correct Option: A  [ showing a skillful use of underhand tactics to achieve goals ]

Remark:

He had PITY on the beggar. (Synonym)

• cruelty
• brutality
• compassion
• unkindness
Correct Option: C  [ compassion ]

Remark:

Pawn(Find Synonym)

• Scrounge
• Hire
• Pledge
• Sponge
Correct Option: C  [ Pledge ]

Remark:

Preamble (Find Synonym)

• definition
• mediation
• conclusion
• introduction
Correct Option: D  [ introduction ]

Remark: A preamble is an introductory statement in a document.

The children were very vivacious in the play ground.

• smiling
• sportive
• lively/full of life
• joyful
Correct Option: C  [ lively/full of life ]

Remark:

The doctor prescribed a THERAPEUTIC diet. (find Synonym)

• curative
• Light
• balanced
• low fat
Correct Option: A  [ curative ]

Remark: "Therapeutic" is an adjective that relates to the treatment or healing of a physical or psychological condition.