Bill is on duty today,so he gets to school e____?

Bill is on duty today,so he gets to school e____? is on duty today who is on duty who is on duty today what is on duty today? Who is on duty today?为什么用on duty _____lily______?A.Is,on duty B.Dose,on duty Who is on duty today ?是什么意思 谢谢 whose turn is it ( ) on duty today [what who whose]is on duty? on duty on duty The police are duty on the duty on road.这里为什么用are 而不是用is? whose turn is it-------（be） on duty today Today is my on duty for the day. is duty the on policeman怎么连词成句急 ____is on duty today?Li Lei is.怎么填? Our Staff is available( on duty) 24 hours 这句话的available和on duty哪个更地道呢