Scientists have reached the disturbing conclusion __________ the amount of the solar energy reaching the Earth's surface has been gradually falling.
In order to complete the project ahead of time, the boss demanded that John __ extra hours.
When a new system _____, the old one is abolished.
His mother insisted that he _____ the money in the bank.
The police had to ____ the traffic for an hour due to a train accident.
It’s high time that they _____ some serious work right now.