A study shows the students who are engaged in after-school  activities are happier than        who are not.

ones

those

these

them

考查代詞。句意：一項(xiàng)研究表明，參加課外活動(dòng)的學(xué)生比不參加課外活動(dòng)的學(xué)生更開心?？崭裉幋~與the students是對應(yīng)關(guān)系，可以用the ones 或者those替代。“them”指代前面提到的復(fù)數(shù)名詞，不能與the students形成對應(yīng)關(guān)系，“these”一般不用定語從句修飾。故選B項(xiàng)。

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

a 8-year-old boy

an 8-year-old boy

a 8-years 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，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)。

          no bus,we had to walk home.

There was

There being

Because there being

It being

考查獨(dú)立主格結(jié)構(gòu)。句意：沒有車，我不得不走路回家。根據(jù)句意，表示“存在”，要用there be 句型；分析句子可知，設(shè)空處應(yīng)用非謂語動(dòng)詞，there be只有主動(dòng)形式，故用現(xiàn)在分詞；因?yàn)榉侵^語動(dòng)詞有自己獨(dú)立的的主語no bus,所以此處是獨(dú)立主格結(jié)構(gòu)。故選B項(xiàng)。

You don't have to know the name of the author to find a book. You           find the book by the title.

must

need

can

would

考查情態(tài)動(dòng)詞辨析。句意：你不需要知道作者的名字就能找到一本書。你可以按書名找到這本書。A.must必須，一定；B.need 需要；C. can可能；可能；D.would愿意。根據(jù)句意可知，此處表示一種客觀的可能性，應(yīng)使用情態(tài)動(dòng)詞can。故選C項(xiàng)。

Every evening after dinner, if not ________ from work, I will spend some time walking my dog.

being tired

tiring

tired

to be tired

考查省略句。當(dāng)狀語從句的主語和主句主語一致，且狀語從句中有be動(dòng)詞的時(shí)候，可以把狀語從句的主語和be動(dòng)詞一起省略，本題if后面省略了I am，句意：每天晚上吃完晚飯以后，如果不是很累，我就會(huì)花點(diǎn)時(shí)間來遛狗。故C正確。