I have no idea ____ the journalist could have got his in-formation from.[ ]

Studies show that people are more _____to suffer from back problems if they always sit before computer screens for long hours. [ ]

hear Mr Smith was writing a story last year and he still _____.

I’d like to have visited the Palace Museum last week, but something unexpected _____to my father.

We have todo before the exams, of course we can’t watchTV now.