Ответ:
The total production of bushels of corn in the United States is more than that of
all other cereal crops combined.
Are these clean notebooks?
I am right, aren't I?
Do I have to get ready now? - Yes, it's time we went. [После it's time используется Past Simple]
The southern part of Kazakhstan land is mountainous.
My brother goes in for sports.
California relies heavily on income from fruit crops, and so does Florida.
He speaks as if he had visited London himself.
When you go abroad, be very attentive.
She looks after passengers.
Правильно будет: One man entered, (and) then a second (entered).