To live a low﹣carbon life, we must remember ____ the lights when we leave the room.( )
to turn off
turning off
not to turn off
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
The girl used to be shy,but she is______ getting active in team work and willing to make friends.( )
usually
gradually
mainly
seldom
He's already playing in a band, and he only_____ playing the guitar a year ago!( )
took up
set up
put up
gave up