1. because/ heavy rain/ many students/ be late/ class/ yesterday.=> ....... Because of the heavy rain, many students were late for class yesterday......

2. Mr. Pike / charge of / office / while / director / away / vacation.=> ..........Mr. Pike took charge of the office while the director was away on vacation.........

3. It / interesting / walk along / paths / enjoy / fresh air / night / moonlight.=> .........It is interesting to walk along the paths and enjoy the fresh air at night under moonlight...................

4. pupils / many grammar exercises / that / may understand / grammar rules.=> .........Pupils do many grammar exercises that may understand many grammar rules..................

5. regular exercise / only help in / control weight/ but / prevent / illness.=> ........Regular exercise not only helps in controlling weight, but also preventing illness........................................