1 : he ( have ) ........was having........ dinner when his friend called

2 : Joan ( travel) ......travels...... around the world

3 : we ( not begin) ....haven't begun....... to study for the test yet

4: don't get on a bus while it ( run ) .......is running.......

5 : I ( invite ) ...........invited........ them to my birthday party yesterday , however , they ( not come ) .......didn't come.......

6 : Look ! Somebody ( clean ) ....is cleaning.... the room

7 : my brother ( begin ) ...........began......... looking for a job in January