Поставь глаголы из скобок в форму Past Prograssive. 1. Doctor Fleming discovered penicillin while he … (study) influenza.

2. Sam … (stand) under the tree because it … (rain).

3. When the teacher came into the classroom, the children … (run).

4. When I arrived at the party, all the guests … (dance).

5. The waiter cut his finger while he … (pick up) the broken glasses.