That pair of shoes ________ too expensive. Can you show me __________ pair?
She promised that she could finish the work by ___________.
When our parents are not at home, we need to ______ ourselves.
The volunteers kept on searching for the missing people in the earthquake, _____they were hungry and tired.
--- Shall we take a bus to the library? --- It’s not far. I think we________ take a bus. Let’s walk there.
—When did you start to collect stamps? —I got my ______ stamp when I was ______ years old.