Lawrence Craven, a doctor from the USA, is the author of several published reports, one of which introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks by thinning blood.

One of the rules is that everystudent ________ wear school uniform while at school.

What he’d like __________a digital watch.What he’d like__________textbooks.

There used to be lots of fish in thelake.— Yes, but there are very __________ now.

thecrowded bus , who was dressed in a blacksuit and waved to a woman