Sheldon could have defeated Howard in the match, but he _______ too careless at the last minute.

The earthquake ______ when I _______some cleaning.

Could you play ________ basketball when you were a primary school student? —- No, I couldn’t, but I could play ________ violin.

To ____ nature is to help ourselves, or we will be punished.

______ number of the students in Class 1 ______ forty-four.