Ответ:
1- have to . 2-must. 3- mustn't. 4- have to. 5- must.6-doesn't have to
1 inventors
2 discovered
3 records
4 height
5 a trip
6 exciting
7 comfortable
8 absolutely
There are many solutions to the problem of boredom. Firstly, I'm never bored if I have something to do. So, I tend to do something useful, like cleaning the house, help my mother with cooking or something in this kind. Also, I do the things I enjoy to get rid of the boredom. Usually I watch TV, kill time on the PC or do some sport activities. I love to play football with my friends and to ride a bicycle.