thecity’spublicschoolsystemshouldbeopentothechildrenofmigrantworkershas become the focus of discussion.
| A．That | B．If | C．What | D．Whether |
__________knowledge comes from practice is known to all.
| A．If | B．What | C．Where | D．That |
______ surprised the hostess most is _______ one of her friends left the party without saying a word.
| A．What, what | B．What, that | C．That, that | D．That, what |
_______ parents say and do usually has a life-long effect on their children.
| A．That | B．Which | C．What | D．As |
______ leaves the room last ought to make sure that the windows are closed and the door locked.
| A．Whoever | B．Who | C．Who will | D．Those who |
_____ the flight to New York will be delayed is ____ I'm especially worried about.
| A．If; what | B．Whether; that | C．When; that | D．Whether; what |
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