Only in this way_______ finish the work ahead of time.
She was afraid __________ the dog in case it became dangerous.
I__________ you somewhere before, but your name has escaped me_________.
What worried the child most was _________ to visit his mother in the hospital.
--How long ___________ each other before they__________ married? --For about a year.
—When__________ and visit our exhibition next month? — When_______, I will let you know.