Question

There are commas missing in the following sentences. Can ya help me find where. Thanks!

Answer 1

2. The race, therefore, was equally challenging to all the contestants.
3. Are you going to join us for tea, Mrs. Collins?
4. The rowers, of course, were exhausted after the three-hour race.

Answer 2

1. The race, therefore, was equally challenging  to all the contestants.

2. Are you going to join us for tea, Mrs. Collins?

3. The rowers, of course, were exhausted after the three-hour race.