People have the belief ______ factories should produce fewer things from raw materials, ______the supply is growing smaller and smaller.

—Would you like______ to eat ?—Yes，please.

 He didn’t make ____ clear when and where the meeting would be held.

A scientist who can speak English is in closer touch with those of other countries than ______ who doesn’t. 

In American there are more households(户主) with pets than ____ with children.