1．Aid groups are struggling to reach the hardesthit areas where food and drinkable water are difficult ________(find)．
答案：to find 考查非谓语动词。句意：救援小组正努力到达食物和饮用水很难找到的重灾区。此句中，“food and drinkable water are difficult ________”为“主语＋be＋形容词＋to do”句型，且不定式to find和主语food and drinkable water 之间构成动宾关系，应当用不定式的主动表被动。
2．—My dear, you are always ________(throw) things about. Look, what a mess in the room!
—Sorry, Mom.
答案：throwing 考查时态。句意：——亲爱的，你总是把东西扔得到处都是。看，你的房间多乱啊！——对不起，妈妈。由句意可知，此处妈妈在埋怨孩子把东西到处乱扔，所以用进行时态，因为进行时态与always、forever、constantly等表示频率的词连用，表示说话者的埋怨、评判或者表扬等语气，意为“总是，老是”。
3．—Got your driving license?
—Yes.It is a week since I ________(pass) the driving test.
答案：passed 考查时态。since所接从句用一般过去时态，主句用现在完成时态。
