Subject verb agreement with quantifiers

All of the kids I teach ___ a problem spelling English words.

• have

• has

Plenty of people ___ mistakes when typing emails in a hurry.

• makes

• make

Most people who ___ musically trained have good language skills.

• be

• are

• is

Of the people I tutor, each one ___ a new set of problems.

• bring

• brings

In my circle of friends, no one ___ on the phone anymore.

We all text.

• talk

• talks

I think that two-thirds of the email messages I get ___ spam.

• are

• is

• be