T3
The letter proposes the school should open classes outside the classroom because good scenery will make the students focus and avoid boredom and the school has installed some benches and seats outside.
The student disagrees with the proposal.
First, there are too many distractions outside. Students will be distracted when friends are passing through.
Second, there aren’t enough seats available, it’s inconvenient for students to take notes if they have to stand there.
T4
Population cycle in ecology system: mice and wolf. Wolf is the predator and mice is the prey. There are three steps：1. When mice are numerous, wolves have enough food. Then the number of mice decreases and the wolves get increased.
When the number of mice decreases, the wolves lack of food and then the number of wolves decreases. Later the number of mice increases. 3. It turns back to step one.
T5
The man’s problem is that he left his keys in the dorm and he forgot to take his paper with him, which should be handed in today. He’s roommate was in another city now. There are two solutions for him. First, he should tell the professor but his paper was regarded late. Second, he could ask the administrator of the dorm to open the door but it would cost him 15 dollars.
T6
The professor talks about two types of suspense in a movie.
The first type is that the audience feels interesting to guess the end. For example, two heroes set the same goal, but the audiences have no idea who comes first.
The second type is that the audiences know the end but they have no clue how to get to the end. For example, in a love story, the hero and heroine doom to meet in the end, but how they meet each other becomes intriguing.
(编辑：Sally)