In autumn, the（）fall down from the trees.

单项选择题I usually go to the office（）train.

A.with
B.by
C.on

单项选择题A:（）are your parents? B: They are in China.

A.What
B.How old
C.Where

单项选择题Look at Tom! What（）?

A.does he do
B.is he doing
C.he is doing

单项选择题Does he（）on weekends

A.usually works
B.works usually
C.usually working

单项选择题There aren't（）books in my bag.

A.no
B.some
C.any