--- ____ busy schoolwork, the children also have to take arts, music and sports classes in their free time.--- I wonder what they will become.
--- How long have you been here? --- _____ the end of last month.
We keep in touch ____ writing often.
Who is it up _____ decide whether to go or not?
____ that they are inexperienced, they have done a good job.
Thank you for the trouble you have ____ to help me.