After four years’ research, we now have a ______ better understanding of the disease.

 The students are ___ young people between the ages at between the age of sixteen and twenty.

At Sam’s birthday party he had many guests, who were ________friends of his.

There was such a long queue for coffee at the interval that we_________gave up.

The food ran out early, but __________ the party was a success according to the guests present that evening.