【单选题】
They are not only teachers __________ our friends
①
but for
②
but also
③
however
④
whoever
【单选题】
We should be pleased to send you some samples of our new printers on approval, _______ our own expenses.
①
at
②
on
③
for
④
in
【单选题】
10.In January, 2004, the United States successfully launched “spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
①
it marked
②
marking
③
marked
④
to mark
【单选题】
13. Where is my pen? I ______ it.
①
might lose
②
would have lost
③
should have lost
④
must have lost