—Shall we invite Tim? —No, it’s too late to invite any more people. _____, he hates parties, you know.

Mass production has made （ ） the goods and services we want at a lower price.

（ ） when she started complaining.

The defense computers calculate way to （ ） the enemy missiles.

I cannot tell the_____difference between the twins.

Scientists say it may be five or six years （ ） this medicine is tested on human beings.

As population increases, （ ）.

Three of us will go there, and the rest （ ） to stay here.

It was in the factory （ ） you worked five years ago （ ） you learned the technique.

He made another wonderful discovery, （ ） of great importance to science.

Having been found guilty, the man was given a severe （ ） by the judge.

_____, the professor is still trying to learn a new language.