1. His failure ____ his carelessness and laziness.

　　A. resulted in B. led to

　　C. contributed to D. was attributed to

　　2. On hearing the joke, he burst into ___.

　　A. a loud laughter B. loud laughs

　　C. loud laughter D. loud laughings

　　3. The police are ___ the records of all those involved in the crime.

　　A. looking out B. looking after C. looking into D. looking on

　　4. The manager needs an assistant that he can ___ to take care of problems in his absence.

　　A. count on B. count up C. count in D. count out

　　5. Not only the professionals but also the amateurs will ______from the new training facilities.

　　A. derive B. acquire C. benefit D. reward

　　1. [D]

　　解析：result in意为“导致”;lead to 意为“通向;导致，引起”;contribute to意为“有助于，促成”;attribute…to 意为“把…归因于”。

　　2. [C]

　　解析：burst into laughter 突然大笑(=burst out laughing)。

　　3. [C]

　　解析：look out意为“注意，留神”;look after 意为“照料，照管;注意，关心”;look into 意为“调查，观察”;look on 意为“观看，旁观”。

　　4. [A]

　　解析：count on/upon 意为“依靠，指望”;count up 意为“算出…的总数，共计”;count in 意为“把…计算在内”;count out 意为“逐一数出;不把…算入”

　　5. [C]

　　解析：derive from 意为“来源于，来自于”;acquire 及物动词，意为“获得，学得”;benefit from 意为“受益于”;reward 及物动词，意为“报答，酬劳”