He’ll be an astronaut by the time he_____thirty.

When he was()he had become a professor. A: in his early thirty B: in his early thirties C: in his thirty early D: in his thirty earlier

He began to write poems in his ____. A: thirtieth B: thirty C: thirty's D: thirties

You can be sure that he is somewhat _____________. A: in 30 years old B: in the thirties C: in thirty years D: in the thirty

184.一My father was born .When he was ,he went abroad. A: in 1970；in his thirty B: in the 1970s；in his thirties C: in the 1970；in his thirty D: in 1970s；in his thirties

He looks about thirty, tall, and (shave)_________ . In my opinion, he looks like a normal artist.

How old is the man A: He is twenty years old. B: He is thirty years old. C: He is forty years old.

When he finally emerged from the cave after thirty days， John was

At the age of （）, he had his own lab. A: thirty B: thirtieth C: the thirtieth

－_____ is your father? Does he still work as an engineer?－Yes, he has been an engineer for thirty years.（2015安徽）[1分]