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The American and the British _____ a large number of social customs.
The American and the British \_\_\_\__ a large number of social customs.
_____ it is very late now, the researchers are still working in the lab.
\_\_\_\__ it is very late now, the researchers are still working in the lab.
The lecture was so_____ that everyone went to sleep.
The lecture was so\_\_\_\__ that everyone went to sleep.
The decision about such a big project cannot be made _____ each member of the board agrees.
The decision about such a big project cannot be made \_\_\_\__ each member of the board agrees.