It has escaped mewe stopped in the last class．Tom，would you tell me so that I can go on with my lecture?

.— Is there any possibility ____ you could pick me up at my office at 7：00 tomorrow evening?— No problem.

Who is the woman ________ a red sweater? —She’s my sister. [ ]

_______ the teachers in the school is one hundred, and ________ of them are women teachers.

The newly built school canteen(餐厅) is big enough to hold two ________ students at lunch time.