cast iron

noun (uncountable)

Gusseisen das

cast-iron

adjective

1.	[made of cast iron] gusseisern

2.	(fig) [will] eisern [alibi, guarantee] hieb- und stichfest

cast iron

French

Spanish

Italian

Complétez la séquence avec la proposition qui convient.

This exercise … be difficult, my younger brother can do it!
- mustn't
- can't
- must