—Have you ________ him to keep good hours? —Yes, I have. But he doesn’t listen to me.
----That is ________ you spent your summer holiday, isn’t it?---- That’s right.
Human beings are different from animals _________ they have languages.
At school, some students are active, ______ some are shy, yet they can be good friends with one another.
___________ seems hard to believe is that the bird the officer uses is the same bird often seen in public parks----the pigeons.
I’d appreciate _______ if you could let me know in advance whether you will come or not.