You can only be sure of_____you have at present;you cannot be sure of something_____you might get in the future.()
We are living in an age _______ many things can be done on computers and the Internet.
Her sister has become a lawyer, _______ she wanted to be.
_______ is often the case, we have worked out the production plan.
—Do you have anything to say for yourselves? —Yes, there’s one point _______ we must insist on.
—Why does she always ask you for help? —There is no one else _______, is there?