Mrs. Black doesnt believe that her son is able to design a digital camera, ______?
What’s the best way __ learning English?
The ___ people must continue what the dead didn't finish.
--I’m sorry, I am too busy to help you, but my brother can.I’ve told him to.---______.
Mike pretended ___ Chinese when I came into the classroom.
We thought Tom wouldn't pass the exam, but to ___, he passed.