1 https://elt.oup.com/student/headway/elementary4/grammar/unit02/hwy_elem_unit02_1?cc=cz&selLanguage=cs
2 https://elt.oup.com/student/headway/elementary4/grammar/unit02/hwy_elem_unit02_2?cc=cz&selLanguage=cs
3 https://elt.oup.com/student/headway/elementary4/vocabulary/unit02/hwy_elem_unit02_1?cc=cz&selLanguage=cs
4 https://elt.oup.com/student/headway/elementary4/vocabulary/unit02/hwy_elem_unit02_2?cc=cz&selLanguage=cs
5 the time http://www.englisch-hilfen.de/en/exercises/various/time.htm
6 sights in London http://www.englisch-hilfen.de/en/exercises/countries/sights_london2.htm