ПОМОГИТЕ С АНГЛИЙСКИМ нужно вставить в пропуски

1)To place an order _______ some company
a)with b) inc) at
2)to be heavy ______ orders at the moment
a)underb) withc) in
3)to meet the requirements _____ the customers
a)tob) ofc) for
4)to be in great _____ demand
a)on b) forc) in