Choose the correct options

1. Fiona [watches|has been watching] TV since 10 this morning instead of [studied|studying].
2. Nicola [had been working|was working] for ten hours before she [had been taking|took] a break.
3. The scientist [is going|goes] to the laboratory every day to carry [out|in] some tests.
4. When Liam arrived at the airport, he [knew|was knowing] where to go because he [had visited|was visiting] the city many times before.
5. Dan [used to|is used to] be a journalist, but now he [presenting|presents] the news on television.