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Question 13:
Не
try to be a bit more punctual. It's rude to be late here.
shouldn't
couldn't
was able to
should
Question 14:
He lost the key, so he couldn't get into the house.
Because he lost the key, he could get into the house.
Because he lost the key, he couldn't get into the house.
Because he lost the key, he can't get into the house.
Because he lost the key, so he couldn't get into the house.
Question 15:
country/ with/ Vietnam/ 54/ is/ multiethnic/ a/ groups/ ethnic.
Vietnam is 54 ethnic groups with a multiethnic country.
Vietnam a multiethnic country is with 54 ethnic groups.
Vietnam is with a multiethnic country 54 ethnic groups.
Vietnam is a multiethnic country with 54 ethnic groups.