_______ we admit that there are still some problems about the system of modern education, we don’t mean that it is of no use.
______ the weather, we had a pleasant time.
I found the island a wonderful place for our experiments _______ the hot weather.
He usually goes to work by bike _______ it rains.
She knew nothing about his journey _______ he was likely to be away for three months.
---- “How did the robber get in?” ----“______ an open window on the first floor.”