-Did you hear that Tonna took social management as her major?-Yes, but she shouldn't have, you see. This kind of subject __________ one's communication ability, and that's what she is most weak at.
It was not until dark _____ he found _____ he thought was the correct way to solve the problem.
_________ this is the biggest mistake we have made.
It i s the second time that the poor area_______.
In modern times, the development of science is ________ .
He insisted that his plan _______ carried out at once.