I’m ______ at sums than Jean， but better at history.

--What’s your opioion ?  ----My opinions are ___.

The disappearance of dinosaurs made _______ the evolution and dominance of mammals on the earth.

We can’t work together any more ; I think it’s time we went our ______ ways.

 While sometimes it’s necessary to have phone calls in public, loud phone conversations are not so     .