1. When spring _____ (come),the animals which sleep in winter start waking up.
2. Our manager _____ (go) to Paris on business already and he will be back in a few days.
3. The Eiffel Tower _____ (design) by a Frenchman called Gustave Eiffel over 100 years ago.
4. While we _____ (travel) in Australia last summer, I visited Lucy who once taught English in our school.
5. The suspect denied _____ (steal) the valuable painting before the witness appeared.
6. We will have no water to drink or use if we  _____ (not stop) wasting it now.
7. The world's first great nurse Nightingale's birthday _____ (become) International Nurses' Day in 1974.
8. Scientists _____ (study) the global warming for several years. They are working hard to find a solution.
9. I'm sorry I didn't hear you because I _____ (listen) to music.
10. The Conference on Poverty Reduction (扶贫大会) _____ (hold) in Shanghai in May, 2004.