下列各句中，加横线的成语使用正确的一项是（ ）

At present more and more couples ___________ have a second baby _____________ their first child can feel less lonely.

If the motorbike driver had slowed down when he turned, the accident could have been _____．

Department of Homeland Security and CIAproduced ______ joint report on Monday warning that ______ next 911 could infact occur on ______ different date

Why not _________ your teacher for help when you can’t finish __________ it by yourself