Every boy and every girl as well as some teachers who __________ to visit the museum __________ asked to be at the school gate before 6:00 in the morning.
__________ in the mountains for a week, the two students were finally saved by the local police.
When different cultures, we often pay attention only to the differences without noticing the similarities.
Unless ___ to speak,you should remain silent at the conference.
When I came back, I found my clothes , on the bed.
We should take different measures different conditions and different occasions.