Fill in articles. Put ‘–’ for the zero article. (Вставь артикли. Для нулевого артикля используй знак «–».)
1. It’s ... good news!
2. Stay in ... bed if you feel ill.
3. We saw birds in ... sky.

1. It's good news!
Explanation: In this sentence, the noun "news" is an uncountable noun, so we use the zero article before it.

2. Stay in bed if you feel ill.
Explanation: In this sentence, the noun "bed" is a general noun referring to any bed, so we use the zero article before it.

3. We saw birds in the sky.
Explanation: In this sentence, the noun "birds" is a plural countable noun, so we use the definite article "the" before it. The noun "sky" is a singular countable noun, but when it is used to refer to the general sky, we use the zero article before it.

Step-by-step solution:
1. Determine if the noun is countable or uncountable.
2. If the noun is uncountable, use the zero article.
3. If the noun is countable, decide if it is specific or general.
4. If it is specific, use the definite article "the".
5. If it is general, use the zero article.