短周期元素X、Y、Z和W的原子序数依次增大。X原子的最外层电子数是内层电子数的2倍,Y与X同主族,Z和W原子中未成对电子数之比为2∶1。下列说法错误的是( )
-How many letters you to your mother?
-109 in all, since 2016.( )
has, written
have, written
did, write
are, writing
Bill, stop smoking, you'll get better soon.( )
but
after
or
and
Betty is often seen the lonely old man with his housework.( )
to help
helping
helps
helped
Does the dish taste as as it looks?( )
well
best
good
better
You'd better take the map with you you won't get lost.( )
so that
as soon as
now that
as long as