Look! There is over there. Do you know him?

a 8-year-old boy

an 8-year-old boy

an 8-years old boy

考查形容詞和冠詞。句意：看！那邊有一個(gè)8歲的男孩。你認(rèn)識(shí)他嗎？空格處為復(fù)合形容詞作定語(yǔ)，其基本構(gòu)成形式是：數(shù)詞+名詞（單數(shù)）+形容詞，并且要用連字符連接，排除C和D項(xiàng)；8發(fā)音以元音音素開頭，需用不定冠詞an修飾。故選B項(xiàng)。

I thought we'd be late for the concert, we ended up getting there ahead of time.

but

or

so

for

考查連詞。句意：我以為我們音樂(lè)會(huì)遲到了，但是我們提前到達(dá)了那里。but 但是；or 或者；so 因此；for因?yàn)?；兩個(gè)分句在意義上bu是轉(zhuǎn)折關(guān)系，故用but。故選A項(xiàng)。

There's no simple solution this problem.

of

for

to

about

考查介詞。句意：這個(gè)問(wèn)題沒(méi)有什么簡(jiǎn)單的解決方法。此處是短語(yǔ)“

the solution to....的解決方法”，應(yīng)用介詞to。故選C項(xiàng)。