選擇下面詞組填空，并用其適當(dāng)形式填空：從所給短語(yǔ)中選擇合適的短語(yǔ)并用其適當(dāng)形式填空，其中有兩項(xiàng)多余。

due to，make progress，die out，on earth，on average，make out，adapt…to…，watch over，remind…of…，in harmony with

（1）Up to now，scientists haven't found a clear reason to explain why dinosaurs

died out

died out

about 65 million years ago.
（2）I can't give you an answer to what

on earth

on earth

happiness is，but I'm sure if you love others，you'll get it.
（3）Although our country

has made progress

has made progress

in technological development in the past few years，it still has a long way to go.
（4）

On average

On average

，American kids aged between 3 and 12 spend 29 hours a week at school - eight hours more than they did in 1981.
（5）Every time I listen to the song，it always

reminds

reminds

me

of

of

those days when I was taken care of by my grandparents in my hometown.
（6）It was hard for her

to make out

to make out

who was standing in front of her because of the heavy smoke.
（7）When you go to a new country，you have to

adapt

adapt

yourself

to

to

its customs and culture.
（8）The young mother had to give up her favorite job to

watch over

watch over

her little son who suffered from a rare disease.