How much did you _______________________________（为这台电脑支付钱)？

How much money did your father __________ you for the new car?

How much did the author know about the nuclear fission?

Last year, he went to a big city to ____________________________(碰碰运气).

The teacher told us that this book ________________________(非常值得一读).

After he finished reading the newspaper, he ____________________(将它扔了).

1. When is Christmas celebrated? And how?

2. The field was covered with (一层薄薄的雪)______________.

2. Modern technology owes ecology an________(apologize). 3. Let’s _______ (go) green to get our globe clean. 4. It’s the only earth we’ve________(get). 5. When you ______ (refuse) to reuse, it’s our earth you hurt.