I ________ a topic for the composition, but haven’t decided yet

I thought I had lost my key. But luckily, it ___________ the other day.

I really don’t know _________ I had mymoney stolen

I don’t like any humor in this serious speech because I can’t think of any circumstance ______ this would be beneficial or useful.

Our headteacher____for months to make sure that we understand the importance ofconcentration.