A(n) _____ visitor to the house is unwelcome, because the host doesn’t like to be disturbed.

Where can we get a baseball? —-Let’s ______.

下列句子中，没有语病的一项是

I had trouble finding out the answer _____ the question.

was ________ to his son’s graduatingceremony, and he was asked to deliver a speech in the presence of all thegraduates