根据句意及首字母提示补全单词。
Last weekend we visited Tian'an Men S_______.
Don't swim in the river because it's too d_______.
We should make every effort to p________our environment.
Xi'an is an a_______city.
The Sahara is the biggest d_______in the world.
根据句意及首字母提示补全单词。
Last weekend we visited Tian'an Men S_______.
Don't swim in the river because it's too d_______.
We should make every effort to p________our environment.
Xi'an is an a_______city.
The Sahara is the biggest d_______in the world.