---You may find the key to the maths problem on page 107. ---Ah, it’s so simple. I wonder why I ________ of that.
______ 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.”