__________ it’s very difficult, remember not to give up until the last minute.
--____are you staying in Ottawa? --About two weeks.
–Oh! There is a snake in front of Jay. --But it seems that he doesn’t ___the danger.
Uncle Wang didn’t stop to have lunch __he finished mending the TV set.
Our teacher said sound___much more slowly than light.
Will you please show me the way to the only tall building ___stands near the post office?