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INTERMEDIATE LEVEL

like: cheaper → →

It's cheaper if you book the tickets in advance. ☊ in advance (of sth) ☊
A small car has the added advantage of being cheaper to run. ☊ advantage ☊
It's cheaper between 6 p.m. and 8 a.m. ☊ between ☊
Personal computers are cheap and getting cheaper. ☊ cheap ☊
It's a false economy to buy cheap clothes (= it seems cheaper but it is not really since they do not last very long). ☊ economy ☊
My own feeling is that we should buy the cheaper one. ☊ feeling ☊
This method has two advantages: first it is cheaper and second it is quicker. ☊ first ☊
We made the journey by land, though flying would have been cheaper. ☊ land ☊
It's cheaper to buy goods in quantity. ☊ quantity ☊