—Haven’t you seen the speed limit sign? Please drive     .—Sorry,but I have to.

Such a problem is＿＿＿＿difficult for a primary school student ＿＿＿. 

It is well known to all that a machine needs fuel to run;    ,man needs food to live on.

—Jenny,they say you have asked for a leave because of a sudden headache.I’m worried about you,and are you ________better now?—I’m all right now,thanks for your care.

. Bob is____ honest boy, and he won’t tell lies.