Betty’s English is _______ than _______ in the class.

________ was known to them that the boss had broken his promise ________ he would give them a rise.

Are you in a hurry? — No, in fact, I’ve got plenty of time. I _______ wait. [ ]

It seems that living green is______easy and affordable A small step masks a big difference

Unlike the fossil fuels of today, biofuels are renewable sources, which mean that they will not____ easily.