Read the text below and choose the best answer for each space. The first one is done for you. Example: (0) A. traveled B. travels C. has traveled An Interesting Collection Erica's grandfather, Max, was a sailor. He traveled all over the world. When he (0) ______ , he collected shells. Now he has shells from (1) ______ different places. Erica always admired her (2) ______ shells. When she (3) ______ nine years old, she started (4) ______ own shell collection. She hopes to have a collection like her grandfather's someday. She knows it will (5) ______ a long time. Erica collects shells from the shores of rivers, lakes, seas and streams. (6) ______ she finds shells in dry places that used to be underwater. Most of the shells (7) ______ she collects belong to a group of animals known as mollusks. Snails, clams, and oysters (8) ______ mollusks. Each animal's shell differs in shape as well as in size and color. A snail's shell is one piece. It is like a tube that turns around (9) ______ as it grows. Clams and oysters have shells made of two parts joined together at one spot. Clams and oysters (10) ______ keep their shells open when (11) ______ resting. Other mollusks have shells called tooth shells. (12) ______ shells look like long needles. Erica (13) ______ collecting shells for three years. She has almost one hundred shells. Max told her it was (14) ______ to care for her collection properly. He taught Erica how (15) ______ her shells. She boils them in water for five to ten minutes. (16) ______ she washes the shells in soap and water. Finally, she puts the shells on pieces of cardboard. On each piece of cardboard, she writes down the name of the shell and when and where she (17) ______ it. Now Erica and her grandfather go looking (18) ______ shells together. Erica even has one or two shells that her grandfather (19) ______ . There are (20) ______ many kinds of shells that both of their collections will keep growing for a long time.