Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.
Don’t treat the vase as if it _______ made of steel.
The little girl walks as if she _________ an old woman.
Don't you think it a pity that John ______ have behaved roughly toward us?
In order to do something meaningful, it’s necessary that you _______ determine what is really important.
It is strange that such a thing ______ in your school.