When_________ different cultures, we often pay attention only to the differences without noticing the many similarities.
The number of people invited __________ fifty, but a number of them _______ absent for different reasons.
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 ______.