And some differences ___ obvious. Variants of a language ___ regional varieties of...

Question

And some differences ___ obvious.
Variants of a language ___ regional varieties of standard literary language.
Standard English ___ the official language of Great Britain.
Half of the world scientific journals ___ in English. Нужно вставить нужную форму глагола to be (a.m. is are)

Answer 1

1 are
2 are
3 is
4 is
....