1.

a) I’m overweight.
b) I’m on a diet.
(therefore, however, in short)

2.

a) Larry and Jo Ann are an ordinary couple.
b) Larry and Jo Ann struggle to make ends meet and to do the right things for their children.
(nevertheless, that is, in contrast)

3.

a) In the old days, agriculture was far from mechanized.
b) Oxen were widely used for power and transportation.
(otherwise, in fact, similarly)

4.

a) Feedback plays a vital role for distance language learners as a response to their performance.
b) Feedback is a means of providing support and encouragement.
(moreover, for example, as a result)

5.

a) I had reviewed all my study notes.
b) I did poorly on the test.
(consequently, meanwhile, however)

6.

a) I cannot comment on the whole movie.
b) I slept through the last part of it.
(in addition, in fact, in summary)