Question 1. I started to get worried when they ____________ home. (not / arrive) Question 2. In the past decades, petroleum ____________ the most important fuel. (become) Question 3. Trees ____________ more quickly in summer than in winter. (grow) Question 4. We ____________ Jim since he left school in 2005. (see) Question 5. The traffic ____________ usually as bad as it was this morning. (be / not) Question 6. My sister ____________ to with her family Hanoi last week. (go) Question 7. Johnny ____________ the paper when I interrupted him. (read) Question 8. At the start of his career, Cousteau ____________ the aqualung, opening the oceans to explorers, scientists, and leisure divers. (invent)