You can pay now or ______ you come back to pick up the bike.
Many students’ failure ____ their carelessness in every examination.
After leaving college, Mike was employed in an international company and _____ there ever since.
The weather in London is so changeable that people always take their umbrellas with them _____ rain.
There is no _____ that taking regular physical exercise is good for your heart.
Without ____electricity, how can we search for information on ____Internet?