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V. Complete the sentences with the present perfect form of the verbs in the box.

1. Peter has visited the science museum twice this semester for his project.
2. Have those explorers ever stayed overnight in the rainforest?
3. Sarah hasn't attended any concerts of that singer yet although she’s a big fan of him.
4. We just enrolled in an online course in computer programming.
5. How many summer courses have you completed so far?
6. She’s nervous as she has never tried bungee jumping before.
7. How long have you worked as a volunteer for the WWF?
8. The team is discouraged because they haven't won any competitions yet.
9. Mrs. Molly has already visited five different countries in the past 2 years.
10. My brother has been a class monitor for three years in a row.

VII. Supply the correct form of the verbs.