He has been looking everywhere for you and he still ______.

California has more light than it knows ______ to do wi...

单项选择题California has more light than it knows ______ to do with but everything else is expensive.

The teacher was ______ by his own inability to answer s...

单项选择题The teacher was ______ by his own inability to answer such a simple question.

Whatever the causes, English at the end of the 20th cen...

单项选择题Whatever the causes, English at the end of the 20th century is more widely spoken and written than any other language______.