—Will you be ______ this evening, Mary?—That depends. I am afraid I will be with my manager discussing a plan.

After the introduction of the modern equipment, the factory produced _______ cars as the year before.

All those second-hand goods are sold at ____ before．

Camels have three eyelids to ________ themselves from the blowing sand.

 I can't stand ________ with Jane in the same office.She just refuses ________ talking while she works.