作业!

孩子坐在父亲的肩膀上, 一直在他的头上小心地摆弄着一个冰淇淋. 他的貌似不开心!
The child is sitting on her father's shoulders, while carefully balancing an ice-cream on his head. He does not seem happy!

她对着镜子反思.
She is looking in the mirror at her reflection.

他正坐在操场的滑梯，准备玩!
He is sitting on the playground slide, ready to play!

男人和女人正在结婚，所以他们将要交换结婚戒指.
The man and the woman are getting married, so they are exchanging wedding rings.

她是微笑，也许她刚刚有一些好消息？
She is smiling - maybe she has just had some good news?

他要修理他的汽车，他不想打电话给修理工
He is going to fix his car, he doesn't want to call a mechanic.

他拿着票据捆.
He is holding a bundle of notes (money).

她是做瑜伽，看起来很难.
She is doing yoga, it looks difficult.

熊很生气, 显示出了他的牙, 离开！
The bear is angry, showing his teeth, stay far away!

她的头发被美发师洗.
Her hair is washed by the stylist.

她的牙齿被牙医师拔出.
Her tooth is pulled by the dentist.

作业!

孩子坐在父亲的肩膀上, 则一直在他的头上仔细地相抵着一个冰淇淋. 他的外貌不开心! (他小心地平衡者他头上的雪糕。他看起来并不开心！)
The child is sitting on her father's shoulders, while carefully balancing an ice-cream on his head. He does not seem happy!

她对着镜子看看她反思.（她看着镜中的自己）
She is looking in the mirror at her reflection.

他正坐在操场的滑动（他坐在操场的滑梯上），准备玩!
He is sitting on the playground slide, ready to play!

男人和女人（要）结婚，所以他们（正在）交换结婚戒指. （I think "so" doesn't need to be translated here :)）
The man and the woman are getting married, so they are exchanging wedding rings.

她是微笑，也许她刚刚有一些好消息？
She is smiling - maybe she has just had some good news?

他要修理他的汽车，他不想打电话给修理工
He is going to fix his car, he doesn't want to call a mechanic.

他拿着票据捆(一捆票据).
He is holding a bundle of notes (money).

她是做瑜伽，看起来很难.
She is doing yoga, it looks difficult.

熊很生气, 显示出了他的牙, 保持不远了！（熊露出它的牙齿，生气的离开了）
The bear is angry, showing his teeth, stay far away!

她的头发被美发师洗.
Her hair is washed by the stylist.

她的牙齿被牙医师拉到.
Her tooth is pulled by the dentist.

It doesn't mean your translations are wrong, Chinese people can totally understand your translations. Good job!

作业!

孩子坐在父亲的肩膀上,小心的平衡着他头上的冰淇淋. 他看上去不开心!
The child is sitting on her father's shoulders, while carefully balancing an ice-cream on his head. He does not seem happy!

她看着镜子中他的影子.
She is looking in the mirror at her reflection.

他正坐在操场的滑梯上，准备玩!
He is sitting on the playground slide, ready to play!

男人和女人结婚，他们在交换结婚戒指.
The man and the woman are getting married, so they are exchanging wedding rings.

她在微笑，也许她刚刚有了一些好消息？
She is smiling - maybe she has just had some good news?

他要修理他的汽车，他不想打电话给修理工
He is going to fix his car, he doesn't want to call a mechanic.

他拿着一捆钞票.
He is holding a bundle of notes (money).

她在做瑜伽，看起来很难.
She is doing yoga, it looks difficult.

熊很生气, 显露出了他的牙, 保持距离！
The bear is angry, showing his teeth, stay far away!

她的头发被美发师洗了.
Her hair is washed by the stylist.

她的牙齿被牙医师拔掉.
Her tooth is pulled by the dentist.

作业!

孩子坐在父亲的肩膀上, 则一直在他的头上仔细地相抵着一个冰淇淋. 他的外貌不开心! （他小心翼翼地平衡着在他头上的雪糕。他显得不开心！
The child is sitting on her father's shoulders, while carefully balancing an ice-cream on his head. He does not seem happy!

她对着镜子看看她反思. （的反射）
She is looking in the mirror at her reflection.

他正坐在操场的滑动，准备玩! （操场上的溜滑梯）
He is sitting on the playground slide, ready to play!

男人和女人结婚，所以他们交换结婚戒指. （那个男人与这个女人准备结婚）
The man and the woman are getting married, so they are exchanging wedding rings.

她是微笑，也许她刚刚有一些好消息？ （在，获得了）
She is smiling - maybe she has just had some good news?

他要修理他的汽车，他不想打电话给修理工 。
He is going to fix his car, he doesn't want to call a mechanic.

他拿着票据捆. （他握着一捆钞票。）
He is holding a bundle of notes (money).

她是做瑜伽，看起来很难. （在）
She is doing yoga, it looks difficult.

熊很生气, 显示出了他的牙, 保持不远了！ （露出了它的牙，立即离开！）
The bear is angry, showing his teeth, stay far away!

她的头发被美发师洗.
Her hair is washed by the stylist.

她的牙齿被牙医师拉到. （牙医拔出来）
Her tooth is pulled by the dentist.