--- I thought you were coming to repair the doorbell yesterday.--- I ________. I rang twice but got no answer, so I went home
_______ is expected, according to the online survey, is _______ the price of housing will not go up any more.
-----Alice, you clean the blackboard today, _________? ----- But I cleaned it yesterday.
--- Why is the cake so expensive?---- Maybe you don’t know a cake made of wheat costs less than _____ made of rice.
I _____ sooner but I didn’t know that they were waiting for me .
Experiments of this kind ___in both the U.S and Europe well before the Second World War.