C Fill in if, when, unless.
15 Dan would have had serious head injuries during the ice-hockey event, if he hadn't been wearing a protective ...................... .
16 We defeated the ...................... team four-nil, as two of their players were sent off the field for not following the rules.
17 Bob ...................... at the gym everyday last week, because he is in training for the next cross-country cycling tour.
18 Thousands of fans showed great ...................... when the Montreal Canadians ice-hockey team got the Stanley Cup.