----Do you think Jim will pass the Chemistry exam? ----Sure. He ______a lot of time on it.
Once a computer is put into water, the system _______ and cannot repair itself.
________ 18 June 1940, Churchill gave another fine speech when he drew attention ________ the courage of everyone defending Britain.
The situation at Omaha Beach was so bad _______ the soldiers succeeded in landing on the beach with a lot of people losing their lives.
_______ it two days ago when you arrived home late that you came across her?
Ten _______ teachers in our school will be selected to teach Chinese in London .