第1题:
some
all
few
many
第2题:
provided
unless
except
so far as
第3题:
become
has become
becomes
is becoming
第4题:
第5题:
Until
After
Unless
Before
第6题:
often
rarely
yet
still
第7题:
made a kind of flying machine
tried to fly with wings made of chicken feather
wanted to build a kind of balloon
tried to fly on a large bird
第8题:
pulled
pushed
permitted
protected
第9题:
on
about
at
with
第10题:
allow
admit
present
grant