Вставьте as...as, so...as.
1)This book about the UK is __ heavy __ that one.
2)These mountains are __ old __ those mountains in the USA.
3)Now he speaks English not __ fruently __ he did a year before.
4)The Volga is not __ long __ the Nile.
5)Literature is __ interesting to me __ History.