D/ Fill in the blanks with the correct tense of the verbs:
1. The scientist....(be) interested in fossils since he was young.
2. In 2010, a boy... (explore) the bone of a mammoth near his house. 3. In the past few months, the scientists... (find) the bones of a giarl crocodile.
4. During the late 1900s, a group of researchers... (invent) the bones of two mammoths.
5. The report.... (warn) people about the hurricane.
6. This is the second time I.... (watch) this comedy with my boyfriend.