My father was preparing for his speech __ my mother was doing some washing last night.

--I can’t solve the math problem because it is too difficult. What should I do? -- _________ ask the teacher for help?

The book was written in _________ easy English _________ even primary school students could understand it.

---I am going to Nanjing and stay there for a week. ---_________you are there, would you please buy some books for me?

I try to eat junk food only once a month _____ I love it.