Betty _(think) the best part of her research is _(try out) an idea to see if it will work, thinks trying out, When Peter was six, he _(start) receiving pocket money from his mother, started, There he _(ask) why he liked space so much, was asked, These experiences have influenced his life. Now David _(study) space science, is studying, Little Dora always wanted a sister. So when Mum _(tell) her she would have one in six months, told.

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