General Knowledge

Below each sentence some alternative given which can substituated the underlined part. Find out the choice which can correctly substituate that part of the sentence.
1. I complimented him for his success in the examination.
    a. about  b. on  c. at  d. No improvement

2. The officer looked on my complaint
    a. looked of  b. looked into  c. looked to  d. No improvement

Choose the word nearest in meaning to the given word
3. CRASS
   a. wicked  b. zigzag  c. spiritless  d. insensitive

  Choose the word opposite in meaning to given word
4. LEAP
   a. plunge  b. sink  c. immerse  d. fall