1 . 这种钢笔写起来这么流畅，一直很畅销。
This kind of pen _____________________________ all the time.

2 . 那个男孩跑得太快了以至于我赶不上他。
________________________________

3 . We were too busy discussing the problem to remember to go for lunch. (保持句意基本不变)
We were ________ busy discussing the problem that we ________ to go for lunch.

4 . Daniel很有耐心以至于和全班同学都相处得很好。
Daniel _________________________________________.

6 . The students were too tired to stay awake in class.（保持句意基本不变）
The students were ________ tired that they ________ stay awake in class.

7 . These are sweet memories. I will never forget them. (保持句意基本不变)
These memories are ________ sweet ________ I will remember them forever.

9 . 北京冬奥会开幕式很精彩，我们都很欣赏。
The opening ceremony of Beijing Winter Olympics ______________ we all enjoyed it.

10 . 他如此疲劳以至于他一躺下就睡着了。
He was ____________________________.