Complete the sentences using must or can`t with a suitable verb below to express a strong conviction that something is or is not true.
1.(The phone rings.)That must be David.He said he`d phone for a date
2.(The phone rings.)That Laura.She`s on holiday.
3.He`s got three cars and two houses.He a lot of money.
4.He lives in one room and only eats once a day.He a lot of money.
5.They speak German to each other at home.They German or Austrian.
6.He starts work at five o`clock in the morning so he early.
7.He starts work at five o`clock in the morning so he late.