Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.
There is a lot of evidence ________ stress is partly responsible for disease.
It is reported that the company has ________ a new household robot.
— Have you found the novel I lent you two weeks ago? — Sorry, I can’t find it ________, but I’ll give it back to you later.
The time is drawing near ________ we’ll have to make a decision one way or the other.
— I’d like to fix an appointment with the director. Would nine tomorrow morning be all right? — ________. He’s got rather a full day tomorrow.