``英文`` help help 我../

Look at the seating plan. Then complete the sentences below with the correct preposition in the box. Each word should be used ONCE only.

to the right of / behind / between
in front of / to the left of / beside
next to / at the back of
___________________________________
[__________BLACKBOARD___________]
_________ ________ _______
(__Martha_) (_Anita__) (_Nancy_)
________ ________ ________
(_ Alfred_) ( _ Alex__) (__Leo__)

1.Martha is sitting ____________ Anita.
2.Leo is sitting ___________ Alex.
3.Alfred is sitting __________ Martha.
4.Alex is sitting __________ Alfred.
5.Nancy is sitting __________ Anita.
6.Anita is sitting _________ Martha and Nancy.
7.Martha, Anita and Nancy are sitting ___________ the blackboard.
8.Alfred, Alex and Leo are sitting __________ the classroom.