I called you yesterday evening, but nobody answered the phone. –Oh, I ___ a walk with my parents at that time.
Excuse me, is the post office? —About 500 metres away. [ ]
We should return the books to the library _______ time.[ ]
What do we need to pack for the beach vacation, mum? — I guess we need sunglasses to _________the sun.
We must try ______ best to make our city more beautiful.