第1题:
before
while
as
after
第2题:
第3题:
第4题:
第5题:
had been paid
has been paid
will be paid
will have been paid
第6题:
第7题:
if
unless
when
though
第8题:
to be treated
to treat
treated
treating
第9题:
第10题:
第11题:
would
should
must
ought to
第12题:
have frequent visits and phone calls
improve their family relationship
have two smaller sleep periods
rely mainly on light therapy
第13题:
He has changed his plan.
He has canceled his trip.
He is arriving this afternoon.
He forgot to arrange his trip.
第14题:
She doesn’t like Kunming.
She doesn’t have the money.
She doesn’t want to go with the man.
She doesn’t travel much.
第15题:
will be
is
to be
be
第16题:
start more research programs
make more advanced electric cars
develop renewable and coal-based energy
conduct studies related to climate changes
第17题:
An Ideal Place for Shopping
A City with the Best Climate
The World’s Best City to Live in
The World’s Most Beautiful City
第18题:
第19题:
第20题:
if
though
till
because
第21题:
once college graduates take a temporary job, they soon get used to it
college graduates have the habit of taking temporary jobs
many college graduates might never find jobs for which they are trained
college graduates are accustomed to taking permanent jobs
第22题:
第23题:
fixed
fixing
being fixed
to fix
第24题: