When it comes to “empty-nest syndrome(综合症)”, parents are advised to _______regular contact with children through phone calls, emails, texts or video chats. 

 Helen always helps her mother do the housework even though going to school ________ most of her day. 

 I fear that I may create a bad ________by arriving late for the interview.

I think you should go back to your     plan, which is much more practical than the present one.

 ______ 6 world powers have accepted ______ Iranian offer for talks on its disputed nuclear program.