write a, an or the in the blanks to complete the sentences. 2. Mark is _ only child in _ family. 3._ doctor gave Jane _ injection. 4. What's _largest animal in _ world? 5. there's _ nest in _ tree. 6. Sue is writing __ letter to her grandpa. 7. Jack has __ brother and __ sister. 8. we reached ___ top of _ hill in two hours.​