Превратите Present Perfect в Past Perfect
1.Teacher: "He hasnt been to school this week."
2.He:"I ve never tried skateboarding."
3.She: "Mr.Black has written three books".
4.Doctor: "He has eaten too much chocolate."
5.Mum: "Lucy has drunk six cups of coffee today".
6.Lucy: "She has never swum in the sea".
7.I: "I haven t met Richard before."

1) was reading; fell 2) began ; were driving 3)was playing ; broke4)was shaving ; cut;5) occurred ; was snowing ; 6) were dancing ; stepped ; 7)was trying ; rang; 8) was preparing ; went. 9) was driving ; hit. 10) started; was playing 11) rang ; was taking 12) were walking ; met 13) arrived ; was sleeping 14)started ; was hiding )15) was raining; fell; broke. 16) were you studying ; began 17) was driving ; happened 18) were they painting ; began 19) were you watching ; called 20) was walking ; found 21)began , was calling или called

In the city houses are taller than in the country - в городе дома выше чем в деревне
in the city bridges are longer than in the country - в городе мосты длиннее чем в деревне
in the city streets are wider than in the country. - в городе улицы более широкие чем в деревне
in the city rivers are dirtier than in the country - в городе речки грязнее чем в деревне
in the country houses are smaller than in the city - в деревне дома меньше чем в городе 
in the country rivers are cleaner than in the city - в деревне речка чище чем в городе
in the country gardens are bigger than in the city - в деревне сады больше чем в городе