从方框中选择恰当的单词或短语.并用其正确形式填空. twenty cover pollute danger stand out 1. Look! All the tables are with new

从方框中选择恰当的单词或短语，并用其正确形式填空。

twenty cover pollute danger stand out

1. Look! All the tables are 　　　　 with newspapers now.

2. It’s very 　　　　 to skate on the thin ice!

3. It was my sister’s 　　　　 birthday. She invited many friends.

4. Emily’s red hat made her 　　　　 in the crowd.

5. 　　　　 has become a serious problem in the world now.

在线课程

1. covered 2. dangerous 3. twentieth 4. stand out 5. Pollution