The famous musician, as well as his students, ________ to perform at the opening ceremony of the 2012 Taipei Flower Expo.
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.
—What a pity! Their experiment is a failure. —They ________ better under more favorable conditions.