Fill in the blanks in the given sentence with the correct phrase from those given below – She is seriously ill, please …………….. a doctor.

Call in means to ask someone, usually a professional, to come to your place for help. A seriously ill patient needs a doctor brought to her, so 'call in a doctor' fits the sentence.

• A) Call out is used for summoning emergency services such as police or fire brigade, or for calling workers out on strike. It is not the natural phrase for fetching a doctor in this sense, so it is a weaker fit.
• B) Call up means to telephone someone. Phoning a doctor does not complete the meaning, because the request is for the doctor to come.
• C) Call off means to cancel, as in 'call off the meeting'. It makes no sense when the aim is to bring a doctor in.

Core concept: phrasal verbs with 'call'. Learn each particle with its core sense: up means phone, off means cancel, in means summon to a place, and out means summon for an emergency or call to action. Mains angle: precision in official language matters when drafting government communications.

Trap: many candidates pick 'call up' because it is the most common everyday meaning. Here the sentence needs a person to come, not a phone call.