“ Although ,” the boy said , “ _______ overand over , the maths problem remained confusing to me ” .

____ he had not hurt his leg, John would have won the race

The crossing was blocked by many trucks and buses, made it impossible for us to go to work on time

Mom, my classmates invited me ________ a field trip. May I go with them —OK.

They _______ a meeting when the earthquake happened.