题目内容
根据句意和汉语提示在句子空白处填上合适的单词。
We often begin our speech with “________(女士们)and gentlemen! ”．
He does everything well because he is always ________(严肃的，认真的)about what he does．
They usually buy lots of books ________(虽然)they are not rich．
词汇运用。根据句意和汉语提示在句中横线上填入适当的单词或词组。
It is not ________(容易的)for us to learn English well．
________ ________(等候)your turn when the light is red．
_______________(保护)the environment.