Question

Two years ago Britains were assured that global warming _________________ them warmer, wetter winters but long, hot, dry summer
gave
has given
will give
would give

Answer 1

Two years ago Britains were assured that global warming would give them warmer, wetter winters but long, hot, dry summer 
Косвенная речь. Два года назад Британцев убедили, что глобальное потепление подарит им .... и тд Подарит - будущее время, в косвенной речи Future Simple меняем на Future in the past, то есть will give - would give