昨天我收到我妹妹的来信，但我不知道怎样给她回信。

I ________ ________ my sister yesterday, but I don't know ________ ________ ________ her letter.

你不必去买新的自行车，你可以用我的。

You ________ ________ to buy a new bike; you can ________ mine.

干农活拖拉机比动物又快又好。

Tractors do farm work ________ ________ ________ than ________.

在大海里游泳比在游泳池里游泳更有趣。

Swimming in the sea is ________ ________ ________ swimming in the pool.

因为我走得太慢所以花了很久的时间才到达山顶。

It ________ me too long to ________ ________ ________ ________ ________ the mountain because I didn't walk ________ fast.

你能听到外面呼啸的风声吗？

Could you hear the wind ________ ________ ________?

我父亲在西安出差时参观了兵马俑。

My father visited ________ ________ ________ ________ when he was on ________ ________ ________ in Xi'an.

别担心，我想我们能够准时到达那儿。

Don't worry. I think we can ________ ________ ________ ________.

老师希望学生们这学期学说英语将会很有趣。

Teachers hope the students are going to ________ ________ ________ ________ ________ English this term.

布朗夫人听到这个消息时，高兴得说不出话来。

Mrs. Brown was ________ ________ ________ ________ a word when she heard the news.