根据所给词的适当形式填空
The scientist died in his ____________(forty). What a pity! He should be taken good care of.
The dresses ____________ (they ) are made of cotton, but they sell well because of the famous designer.
He has done his best to give his parents a _______ (surprise) answer.
Would you please help us describe one of the most famous ____________ (direct) appearance in English?
He told me that he _____________ (return) home before 6 o’clock, but he didn’t.
The price of houses _______________(rise) a lot in the past few years.
I don’t know if they ______________(show) around the History Museum yesterday.
The little boy often made everyone he knew __________ (play) with him together in the past.
There is a risk of being killed here, so we will move to another place for        (safe)
As an excellent teacher, she devoted most of her time to        (teach) her students.
___________, our planet, Earth is becoming more and more crowded.(sad)
Are you certain meals in the form of pills are much___________(taste)?
How many___________( toy) trains does your brother have?
At present, it may be difficult to imagine_______________(develop) the desert.
The reporter           the important conference between 8 a.m. and 10 a.m. yesterday. (cover)