When ________ later what the call was about, your friend always answers, “Oh, nothing really”
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.
In order to have a good _______ of English, he decided to go abroad for further education.
A series of books in the library ____ been stolen so that the number of them ____ smaller than before.