--- What happened to you?--- I was lost in the strange city; _______, it began to rain heavily.
— Mum,I really think Dad should have a break and get relaxed. —Yes.He too long.
I thinkefforts we have made to constructnew DeZhou are paying off
— Do remember to charge the mobile phone 12 hours when you first use it. — ______.
While building a tunnel through the mountains, ______.
Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.