---- Why is the cake so expensive?---- Maybe you don’t know a cake made of wheat costs less than _____ made of rice.
—You could always put the decision off a little bit longer. —_____ If I leave it much longer I might miss my chance.
To learn to swim well, ___________.
The next thing he saw was smoke ______ from behind the house.
They began to think about what use could be ______ such materials.
Tom ______ close the window when his attention was caught by a bird.