The door opened and in________.
Climbing hills__________of great help to health.
Her family__________much larger than mine four years ago.Her family__________dancing and singing when I came in last night.
A knife and a fork __________on the table.A knife and fork __________on the table.
Many a professor__________looking forward to visiting Germany now.Many scientists__________studied animals and plants in the last two years.
He is one of the boys who__________here on time.He is the only one of the boys who__________here on time.