| LIST I | LIST II |
|---|---|
| A. V.P. Singh | I. November 1990 - June 1991 |
| B. Chandra Shekhar | II. April 1987 - March 1989 |
| C. H D Deve Gowda | III. December 1989 - November 1990 |
| D. Inder Kumar Gujral | IV. June 1996 - April 1997 |

Identify the part of the sentence that contains a grammatical error:
Each of the boys have submitted their assignment on time.
Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. a healthy diet and regular exercise
Q. are important habits
R. that help maintain good physical and mental health
S. especially in today's busy world