26. —Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
.Never_______Lisa would arrive but she turned up at the last minute.
It was by making great efforts_______she caught up with other students.
as an Olympic event, a sport must be played in at least 75 countries on at least 4 continents.
_______by the growing interest in nature, more and more people enjoy outdoor sports.
Tina was hesitation about the job offer as she did not knowthe company was an established one.