2. I have two sisters. One is a teacher, (a)   is a nurse.

Some people prefer coffee; (a)   like tea.

4. Where are (a)   students? The teacher is waiting.

5. Would you like (a)   cup of tea?

These books are mine. (a)   are yours.

We have two options. One is risky, (a)   is safe.

8. I don’t like this song. Do you have (a)   suggestions?

Some students are talking; (a)   are listening.

She has two phones. One is for work, and (a)   is for personal use.

I need (a)   pen. This one doesn't work.

12. She bought a pair of shoes and then looked at (a)   ones.

Five students passed the test; (a)   failed.

Do you have (a)   question?

I have two tickets. One is for you, and (a)   is for me.

There were ten cookies. I ate five; my brother ate (a)   .

Some children were playing, and (a)   were reading.

I don’t like this seat. Is there (a)   available?

Some of the books are mine; (a)   belong to my sister.

Most students passed the test. Only (a)   failed.

Would you like to have (a)   piece of cake?

He took one apple and gave me (a)   .

She always helps (a)   people in need.

I saw two movies last night. One was a thriller, and (a)   was a comedy.

Only five students are here. Where are (a)   ?

Would you like (a)   drink?

He has three brothers. One is in Japan, and (a)   are in Canada.

Ten people entered the room. Two left early, and (a)   stayed until the end.

Some of the shirts are clean; (a)   are dirty.

This cup is cracked. Can I have (a)   one?

Would you like to try (a)   dish?

Some children are playing in the yard. Where are (a)   ?

We should consider (a)   options before deciding.

Three students passed, and (a)   failed.

He has two pens. One is black, and (a)   is blue.

I ate one slice of cake and saved (a)   for later.

I’ll need (a)   hour to finish this.

Let's look at (a)   examples to make it clearer.

Do you want (a)   chance?

Some employees are here. Where are (a)   ?

One of the twins is a boy. What about (a)   ?

I want to buy (a)   shirt in a different color.

He has three dogs. One is black, and (a)   are brown.

Which movie do you want to watch? Let’s choose (a)   one.

They offered me two jobs. I rejected one and accepted (a)   .

We saw one house, but we want to check out (a)   too.

You’ve eaten one apple. Don’t eat (a)   before lunch.

Of the two cats, one is shy and (a)   is playful.