You should know _______to spend all your money on those impractical fancy goods.

We didn’t know you were in trouble at that time,_____ we would have given you a hand.

Government officials cannot ________ accept bribes(受贿)，but in China quite a few take advantage of their power to break the rule .

 –Have you finished your experiment report, Jane?--Oh, my god! I’ve _______ forgotten all about that.

Ben has not the least_______ of giving up his research.