C．undertook D．encouraged

　　解析：选C　句意：柯林斯先生承诺照顾孩子，以便他的妻子能够和她的两位朋友去俱乐部。attempt to do sth."试图做某事"；hate to do sth. "讨厌做某事"；undertake to do sth. "允诺/答应做某事"；encourage后不能直接跟不定式。

　　4．These pieces of information ________ to suggest who the thief was.

　　A．link up B．join to

　　C．connect to D．connect with

　　解析：选A　句意：这些证据拼凑起来就表明小偷是谁了。本题四个选项都有"连接"的含义，但B、C、D三项为及物用法，即都应接宾语；而A空格后是不定式作结果状语，而不是宾语。故选A。

　　5．In his first class, the young Chinese teacher tried to________to his students that reading is one of the greatest pleasures in life.

　　A．educate B．convince

　　C．convey D．persuade

　　解析：选C　句意：在第一节课上，年轻的语文老师试图给学生们传达这样一种思想：读书是人生的最大快乐之一。educate"教育"；convince"使信服"；convey"传达；表达"；persuade"说服"。

　　6．When she learned the sad news, she found it hard to ________ her tears.

　　A．choke back B．choke off

　　C．choke up D．choke down

　　解析：选A　句意：当她得知那个悲痛的消息时，泪水止不住夺眶而出。choke back "抑制，强忍住"，符合语境。choke off "阻止，制止"；choke up "(因感情激动而)哽咽"；choke down "硬咽，硬吞"。

　　7．My father intended my brother for driving but he wanted to ________ the knowledge of the computer during his spare time.

　　A．pick out B．pick up

　　C．turn out D．turn up

解析：选B　句意：父亲打算让哥哥学驾驶，但是他想在业余时间学点电脑知识。pick out "挑选出"；pick up"接某人，学会，无意中学到，拿起，接收"；turn out"证明是，结