—Who______ it be that is knocking at the door?—It ______ be Father, but I’m not sure.
Three fourths of the surface of the earth ______ covered with water.
We finally bought a house, _________ about seven feet by ten.
The US is ___ number 7, while the UK is _____ the 13th position.
Why ______ we eat outside ______ we have so much delicious food at home?
We should follow the example of our parents, ______ more and taking less.