Scientists generally agree that Earth's climate will warm up over the next 50 to 100 years __________ it has warmed in the 20,000 years since Ice Age.
________ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
We agreed to accept ________ they thought was the best professor in the college.
I don’t know who invented ________ telephone. It’s really ________ most useful invention.
In hot weather, an old tyre can break again easily it’s mended.
____ he grows up can he understand your intentions.