1．I had a headache; ____________(因此) I could not go to your party．
答案：therefore
2．People generally quarrel because they can’t ____________(辩论)．
答案：argue
3．We shall get lots of ____________(好处) from reading good books．
答案：benefit
4．If you ____________(插入) a coin into the mouth，the machine will work．
答案：insert
5．The hotel combines comfort with ____________(方便)．
答案：convenience
