The food safety is a serious ____ in many countries. People should try to solve it.( )
subject
program
problem
opinion
Chinese New Year ________ the Spring Festival.People often eat dumplings.( )
is called
was called
calls
called
Yang Jiang ________ be the boy's favorite writer.He has written a lot to praise her.( )
can't
mustn't
must
need
I bought a big box ________ books for kids in poor areas.( )
collects
to collect
collect
collected
﹣﹣﹣________ do you volunteer in Old People's Home?
﹣﹣﹣Once a week.We hope to help the old more.( )
How soon
How many
How often
How long
In 2022,Beijing will host the Winter Olympics.________ my brother and I want to watch it.( )
Neither
All
Either
Both