He is afraid of ___________ strangers.
---- Is it high time that we _____ on the school building? ---- Yes, it _____.
The cost of sales makes up a large part of the prices that _____.
The captain stood by the window, _____ he could see the top of the tower.
That was the only gate _____ we could rush out and save those _____ were in great danger.
All of the flowers now raised here have developed from those _____ in the forest.