Помогите пожалуйста Люди Дорогие.
Для предложений, действие которых относится к настоящему, выберите 1 правильный вариант сказуемого.

1) He ... her well enough. a) is knowing, b) knows, c) have known, d) has been known.
2) She ... to the music at this moment. a) listen, b) listens, c) is listening, d) has been listening.
3) We ... English for 6 years by now. a) study, b) are studying, c) has been studying, d) have been studying.
4) She ... a walk in the park now. a) is having, b) has, c) has been having, d) has been doing.