Mr Smith, _____ of the _____ speech, started to read a novel.
| A．tired; boring | B．tiring; bored |
| C．tired; bored | D．tiring; boring |
In this experiment, they are woken up several times during the night, and asked to report what they＿＿.
| A．had just been dreaming | B．are just dreaming |
| C．have just been dreaming | D．had just dreamt |
When he was alive, the old scientist used to say that knowledge ＿＿from practice and he gained his experience by doing a lot of practical work.
| A．was coming | B．had come | C．comes | D．would come |
He ＿＿articles for our wall-newspaper these three years, and he ＿＿about forty articles.
| A．has been writing； has written | B．has been writing； wrote |
| C．is writing； has been writing | D．has written； has written |
The children ＿＿very quiet；I wonder what they ＿＿up to.
| A．were； are being | B．are being；are | C．are；do | D．are being；do |
Jim talked for about half an hour yesterday. Never＿＿ him talk so much.
| A．I heard | B．did I hear | C．I had heard | D．had I heard |