Как правильно вставлять have или has

if we had met anna we would have told her everything.

1. in 1995 java was licensed by netscape for use in their internet browser, navigator. 2. basic has been extended by microsoft in its visual basic product. 3. perl was developed by lary wall in 1987. 4. specific problems are not solved by systems software. 5. in the last ten years, speed trap units have been installed by police on many busy roads.