Fill in the blanks with proper modal verbs

Fill in the blanks with proper modal verbs
1.—Could I use your dictionary?——Yes,you ___________.
2.---Must we finish the work tomorrow?---No,you ______________,but you must finish it in three days.
3.How _____ you say that you really understand the whole story if you have covered only part of the article?
4.I missed the bus,so I ____________ go home on foot.(must/ have to)
5.—Need we leave soon?—Yes,you_________.