---Why can't I smoke here? ---At no time__________ in the meeting-room
––– Do you think it's a good idea to make friends with your students? –––________, I do. I think it's a great idea.
When ______ different cultures, we often pay attention only to the differences without noticing the many similarities.
My income is rather changeable, but I earn £73 a day ___________.
Nobody knows _______broke into the house last night and stole the important papers.
—Do you think the thief entered through the back door? —No, if he had, I don’t believe he ______ the living-room window.