Put the verbs in brackets into the Past Simple, the Past

Put the verbs in brackets into the Past Simple, the Past Continuous on Past Perfect Tense. 2.1. / ____________ (to wait) for my sister when _______________ (to start) to rain. 2.2. / suddenly realized that / _________ (to lose) my wallet. 2.3. When they ______________ (to come) to London, they ______________ (to visit) many mu seums. 2.4. Cindy _________________ (to break) her leg while she _______________ (to snowboard). 2.5. Hardly we ____________________ (to finish) dinner when the doorbell rang. 2.6. While we _____________________ (to wait) , we ____________ (to do) crossword puzzles.