1. In Europe, 16 tonnes of
material is (are) used per person per year, of which six tonnes become
waist.
2. Jeremy is untrustworthy. Last Monday he promised to help me with some
redecorating and I thought he’ll (he would) keep his promise but he
didn’t.
3. No one believed he deserved to be called a writer but his lastest (latest)
book was a real sensation.
4. In Cardiff where I was born I used to spend lots of time in parks full of
marvelous roses and now I’m giving you this rose – the symbol of my land and my
love. (Не вижу ошибку. Возможно, имеется
ввиду правописание слова marvelous (это американский вариант) - marvellous
(это британский)