The world has twice as much shipbuilding_______ as it needed in the 1980s

He _____ when the UFO arrived.

The more time you spend ______ your English, the fewer problems you will have ______ it.

_________in the regulation that you should not tell other people the password of your e-mail account.[ ]

What a great weight the mother felt _______ her mind the moment she found her lost child.[ ]