1. What _____ unusual school trip we had! I will never forget it.
A. a B. an C. the D. /
1.【答案】B。解析：考查冠詞和感嘆句。句意：我們的學(xué)校旅行多么不尋常!我永遠(yuǎn)不會(huì)忘。a不定冠詞，表達(dá)泛指，用在輔音音素開(kāi)頭的單詞前;an不定冠詞，表達(dá)泛指，用在元音音素開(kāi)頭的單詞前;the定冠詞，表達(dá)特指。此處是感嘆句“what+a/
an+形容詞+單數(shù)可數(shù)名詞”，unusual是元音音素開(kāi)頭的單詞，前用不定冠詞an。故選B。
2. You’d better not hang out after school _____ telling your parents. They may worry about you.
A. by B. with C. without D. after
2.【答案】C。解析：考查介詞辨析。句意：在沒(méi)有告知你父母的情況下，你最好不要放學(xué)以后閑逛，他們可能會(huì)擔(dān)心你。by通過(guò);with有;without沒(méi)有;after在……之后。根據(jù)題干中“They may worry about you.”講到父母可能會(huì)擔(dān)心你，由此推出要用一個(gè)表示否定含義的介詞，表示“沒(méi)有告知父母”，用without符合題意。故選C。
3. Li Lei didn’t play computer games last weekend. _____, he worked as a volunteer in an old people’s home.
A. Instead B. Certainly C. Though D. Gradually
3.【答案】A。解析：考查副詞辨析。句意：李雷上周末沒(méi)有玩電腦游戲。相反，他在一家養(yǎng)老院做志愿者。instead相反地;certainly當(dāng)然;though然而;盡管;gradually逐漸地。根據(jù)句意可知，李雷沒(méi)有玩游戲，而是去當(dāng)志愿者，空后表示與前面相反的事情，因此instead符合語(yǔ)境。故選A。
4. Please remember to _____ the electricity and water before you leave the laboratory.
A. take off B. shut off C. go off D. put off
4.【答案】B。解析：考查動(dòng)詞短語(yǔ)。句意：請(qǐng)記得在離開(kāi)實(shí)驗(yàn)室前關(guān)掉電源和水。take off起飛，脫掉;shut off關(guān)掉;go off爆炸，走開(kāi)，動(dòng)身，發(fā)射;put off推遲。根據(jù)“the electricity and water”可知此處表達(dá)“關(guān)掉電源和水”，用動(dòng)詞短語(yǔ)shut off。故選B。
5. — Is this hat _____?
— No, the red one is _____.
A. Lucy’s; her B. Lucy; her C. Lucy’s; hers D. Lucy; hers
5.【答案】C。解析：考查所有格和代詞用法。句意：——這頂帽子是露西的嗎?——不是，紅色的是她的。Lucy露西，人名;Lucy’s露西的，-’s所有格;her她的，形容詞性物主代詞;hers她的，名詞性物主代詞。問(wèn)句中空格后沒(méi)有名詞，故應(yīng)用-’s所有格表示所有關(guān)系，即露西的帽子;答語(yǔ)空格后沒(méi)有名詞，故應(yīng)用名詞性物主代詞hers代指her hat。故選C。