I a middle school student ( )
am
is
are
Earth Day____in 1970 for the first time, and the Day now includes events in more than 190 countries and regions (地区).( )
celebrated
was celebrated
is celebrated
has been celebrated
Livestreaming (直播)___a new chance for traditional culture artists.( )
practices
provides
promises
protects
Sophia waited for a reply, but____came.( )
either
another
neither
none
Corn production____nearly 125 percent over the past 25 years in China.( )
jumped
jumps
will jump
has jumped
She says that she'll have to close the restaurant____business improves.( )
if
after
unless
when