Not only Pinki but also her friends _________ buying books.

• is
• has
• have
• are
Correct Option: D  [ are ]

Remark:

Sir, our list of grievances here ________ a long one.

• are
• were
• is
• was
Correct Option: C  [ is ]

Remark: "list" is a singular noun, and when referring to a singular entity, the verb should also be singular.

One person __________ and several others were injured as the police opened fire on protesters.

• were killed
• was killed
• had killed
• was killing
Correct Option: B  [ was killed ]

Remark:

Neither John nor Alex __________ scored the century.

• have
• was
• has
• is
Correct Option: C  [ has ]

Remark: in case "Neither-Nor" the verb must agree with the second subject (the subject closer to the verb).

Neither the books nor the magazine ________ on the shelf.

• were
• have
• have been
• was
Correct Option: D  [ was ]

Remark: The verb agrees with the closer part of the subject, which is "magazine" in this case. Here "Magazine" is singular subject, so "was" used.

The boy in the bus ________ like your brother.

• look
• looks
• looking
• have been looked
Correct Option: B  [ looks ]

Remark:

Either you or I should ___________ the lead.

• took
• taking
• takes
• take
Correct Option: D  [ take ]

Remark:

Ashok as well his brothers _________ coming today.

• are
• were
• had been
• is
Correct Option: D  [ is ]

Remark:

Each of the students ________ responsible for keeping this room clean.

• are
• has
• is
• have
Correct Option: C  [ is ]

Remark:

The team _______ playing well.

• have
• were
• is
• are
Correct Option: C  [ is ]

Remark: "team" is a collective noun and should be treated as a singular entity. Therefore, the verb "is" (singular) used.