1b  Is he working there today? (вопрос только про сегодня, а не работу вообще, ежедневно, поэтому используем Present Cont.)

2a What are you doing at the moment? (вопрос про данный момент - используем Present Cont.)

 b  What do you do? (Вопрос про профессию, обычное занятие - нужно использовать Present Simple)

3a Why are they finishing early this afternoon?

 b  Do they usually finish work at 4 o'clock?

4a  Does the company develop new software programs? (подсказка уже в ответе - глагол does)

 b What is it currently developing? (действие, протекающее на момент речи)

Verified answer

1. Is he working there today?

2. What are you doing at the moment?

What do you do?

3. Why are they finishing early...

Do they usually finish work...

4. Does the company develop...

What is it currently developing?