She’ll never forget her stay there ________ she found her son who had gone missing two years before.
_____ life exists on any other planet in the solar system still remains a question.
It was almost midnight when a fire _____ in the neighborhood.
There is a peaceful and calm _____ in the country, quite different from that of a big city.
Jack was in low spirits those days and his friends did all they could _____ him up.
See the model ship ____in the pool? That’s what my father made for me last weekend.