Write the following sentences out in full.

1) necessary / must / one / by the end / of / the / investigations / carry out / May.

2) that / It / year / the construction / is / the reservoir / last / was completed / of.

3) difficult / it / kind / to / processes / control / is / this / of.

4) the reservoir site / should / pay / one / attention / to / the choice / special / of.

5) was / pointed / who / it / water / the chief engineer / the / minimal / level / the reservoir / in.

6) not / a dam / to / it / build / and / is / a reservoir / easy.

38. Read the following texts and fill in the missed words. Get ready to speak about different types of reservoirs.