【題目】The first time I ____ Todd, he ____ to some students at the English corner.

【題目】While we ______ think we know what we want, we’re often wrong.

【題目】A large quantity of water _________ polluted in the past twenty years across China.

【題目】—It’s not bad, is it?

【題目】Due to a shortage of medical supplies in a severe epidemic situation, if you offer a mask to someone, you must be ______.

【題目】He didn’t make ______ clear when and where the meeting would be held.

【題目】The customs officer asked, “Do you have anything to _______?” “Nothing.” I answered.

【題目】It’s the third time that Li Ming has been to Xi’an , _______?

【題目】 Many buildings in the city need repairing, but the one ____ first is the library.

【題目】Since that time, we have held five shows with as many as two hundred and fifty people _____.