It was ___she was about to go out ___the telephone rang.

Researchers have found clear and convincing evidence ________ happiness isthe key to better health and longer lives

is known to all is that the DiaoyuIslands have belonged to China since ancient times.

Mrs. White isn’t feeling well these days.She has made _____ with the doctor at three this afternoon.

Raw materials is what we are badly _______ to develop the new plan