The genetic engineering, ______ progress has been very rapid recently, is perhaps the most important of all the sciences.
Don’t handle the vase as if it ____ made of steel.
-----I’m more than happy to go out this weekend. ----- ______. We’ve got so much work to do at that time.
Food supplies in the flood-stricken area ______. We must act immediately before there’s nothing left.
It was foolish of you to take a taxi ______you could walk there in five minutes.
We would have called a taxi yesterday if Harold ______us a ride home.