-These suitcases are too heavy for me to move.-Here, I'll give you a hand __________ them.
This is a very interesting book. I’ll buy it, _____.
This is not very good; I’d like the same one _____ you are using now.
The part he _____ in the movement was important.
You have advised her not to have breakfast in order to stay slim, and this is _____ I disagree about.
The old pianist would listen to our repeated request that he _____ in public again.