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Scientists observed the tigers for six days.
Scientists are investigating the possibility of life on other planets.
When we walked into the classroom, the teacher had already given the assignment.
Some teachers cleaned up the teachers' room.
I think the students will have drunk most of the coffee by the time we arrive.
People believe that San Francisco is a warm city.
________ made the coffee.
_________'s cat broke the vase.
Everyone thinks that San Francisco is the most beautiful city in the US.
Our findings will intrigue the world.
Someone will tell us by this time next week.
Many people visit Disneyland every year.
Someone has washed the dishes.
Someone poisoned ________'s dinner.
What happened to you last night?
John needs to have someone fix his car.
___________ wants to have someone clean her house.