单项选择题

Few people realize ______.

A. how quickly many species of cacti are becoming extinct
B. how quickly much species of cacti is becoming extinct
C. how quickly are many species of cacti becoming extinct
D. how quickly is much species of cacti becoming extinct

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单项选择题

What does Jason say about a friend in need is a friend indeed

A. It is the most important principle for friendship.
B. It is not enough as a principle for friendship.
C. It is outdated and is no longer important.

单项选择题

Which country made travel restrictions before

A. America.
B. Mexico.
C. Canada.