---Allen said something hard to understand at the conference. ---Yes, her remarks left me _______ about her real purpose.

My laptop computer, which no one can ____________, has been out of order for a week.

Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.

You can’t imagine what difficulty we had _______ home in the snowstorm.

There are many talented actors out there just waiting _______.