--This store has such high prices.--- I agree. Never again ___ here.

There is no ______ swimming-pool in this school and the students often go to swim ______. 

—How did you sleep last night? — Oh, I slept like a log last night. What does the underlined part mean?

I think the talk given by the old scientist is ______ worth ______.

Cloning plants is straightforward while cloning animals is _____________ more complicated.