Experiments of this kind ___in both the U.S and Europe well before the Second World War.
A good idea just ______ me — Let’s go swimming.
Only ______ a human being.
Don’t spoil the children. Can’t you make your little boy ______ himself?
On the bus, all the people except the driver ______ to talk and laugh during the journey.
I really ______ whether we win or lose.