I don’t think it is ______taking the trouble to explain the question to him.
We've offered her the job,but I don’t know ____she’ll accept it.
The old town has narrow streets and small houses _____are built close to each other.
When I got on the bus,I_____I had left my wallet at home.
I'm sorry I didn’t phone you,but I've been very busy_____ the past couple of weeks.
---Are you going to Tom’s birthday party?---________.I might have to work.