I have been collecting shell for5years可以改成 I have been colle

I have been collecting shell for5years可以改成 I have been colle I have been collecting shells for three years.和 I have colle I have been collecting stamps _______i was nine years old I have been collecting _____(snowy) globes for seven years. I have never been to an airport before.可以改成：I have never gon I have been there I have been I HAVE NEVER BEEN, I have been to. I have been to I have been trying I have ever been