I’ll never understand how it _____ that he still insisted on going there alone after being told about thepossible danger.[ ]

．We should give a hand to the people ________ need help

Girls used to take fewer advanced math courses thanboys but now they are taking just _______.

Pity you missed the lecture on nuclear pollution.—I____ it, but I was busy preparing for a job interview

下列各句中，表达得体的一句是