Some scientists think that it will take __ of years to make robots do most work for humans. A. hundreds B. hundred C. thousand
She worries __________,so she often feels much___________.
Is there _________on TV todady?
My aunt would rather __________a bus _________ride a bike.
They don’t seem __________who ________for help.
.Your son has kept _________ for two hours. You’d better ask him to have a rest.