Experts believe people can waste less food by shopping only when it is necessary.
It was the first time ______ I ______ here.
Remember never to leave your dog ______. It might bite people around.
_____ of the students who took part in the military training is 450.
_____improve her English, Jenny bought a lot of tapes for herself.
They became good friends during the war, and since then their lifelong friendship has______ tests of life and death.