It's not easy to change habits, ______ with strong will and self-control, it is possible.
A.for B.or C.but D.so
Earth Day ______ in 1970 for the first time, and the Day now includes events in more than 190 countries and regions (地区).
A.celebrated B.was celebrated C.is celebrated D.has been celebrated
Livestreaming (直播)______ a new chance for traditional culture artists.
A.practices B.provides C.promises D.protects
Sophia waited for a reply, but ______ came.
A.either B.another C.neither D.none
Corn production ______ nearly 125 percent over the past 25 years in China.
A.jumped B.jumps C.will jump D.has jumped
She says that she'll have to close the restaurant ______ business improves.
A.if B.after C.unless D.when
