I tried phoning Maggie’s office in the morning, but I couldn’t _____ .

She is too fat, but she can’t ________ sweets.

When everybody was listening carefully, the noise of several people fighting outside____ the professor’s speech.

____ the chance, otherwise you’ll regret it.

People who can’t ____between colours are said to be colour -blind.

Although new problems ______ during the last experiment, they didn’t give up.  

The school was ______ in 1950 and has a history of nearly sixty years.  

Experts say it is an international trend to __________ MP2.5 to check air quality.

Adolescents are warned not to ____________ their pimples in case they get scars.

I don’t know how it ___________ that our car was bumped from behind.