So difficult____it to work out the problem that I decided to ask Tom for advice.

Your colleague is speaking English with fluency.—It’s no wonder．She ____ in the UK for a year as a visiting professor

下列句子中划线词的活用类型，和例句相同的一项是（ ）例句：外无期功强近之亲，内无应门五尺之僮

下列各句中，加线的成语使用恰当的一项（ ）

Now that you like the computer so much.Why not buy it?—Well，I can’t afford ________ computer.