Como dizer "Assíduo[frequentador, aluno, etc]" em inglês

Português: assíduo: que aparece com freqüência, em determinado lugar, constante, freqüente. - Michaelis
Inglês: frequent, regular, assiduous

Regular: happening or doing something very often. - Longman



Exemplos:

1. Could this be because one of the most regular visitors is the Speaker's wife, Sally Bercow?
2. He was a frequent visitor to our house.
3. He is an assiduous student at the prestigious Seattle Institute for Advanced Dental Education, in Seattle, Washington and the Dawson Center.
4. He's one of the bar's regular customers.
5. He was a regular visitor to her house.
6. Jason was a regular customer in the shop.
7. But today a Cambridge University spokesman said: 'It is not true that Professor Hawking is a “regular” visitor to the club in question.