It is required that the students mobile phones in their school, so seldom them using one.
The place was flooded ________ it had been raining for several weeks.
Mr. Smith has been here for only a few days, so he hasn’t left a deep impression _____ us.
I don’t think she will come to the meeting on time,?
It was so dark that he ______.
Next Sunday is Thanksgiving Day.Have you got any idea _____ we celebrate it?