The old man kept on studying Chairman Mao’s ___ in his ___.
It was the training _____ he had as a young man _____ made him such a good engineer.
It was _____ he said _____ disappointed me at that time.
It was not until late in the evening _____ her husband arrived home .
.—___________that he managed to get the information? —Oh, a friend of his helped him.
It was in the street _____ I lost the book.