—What were you doing when I phoned you last night? —I      my painting and was starting to take a bath.

After he had won the first prize, Mr. Su ____ to a restaurant to celebrate with us.

Cathy is taking notes of the grammatical rules in class at Sunshine School,where she_______English for a year.

Half an hour has been made full ______ of _____ the problem.

Scientists have created GM tomatoes which ______ fresh for 45 days, three times as long as normal tomatoes.