Which is an example of plagiarism? all of the above
using facts and numbers from a source without naming the source
presenting someone else’s ideas as though you thought of them
using a direct quote without using quotation marks

But we pulled at the grill [on the ground] and it gave way. and then we saw iron rings as steps leading down a shaft into a darkness without bottom. … it was a great tunnel. its walls were hard and smooth to the touch; it felt like stone, but it was not stone. on the ground there were long thin tracks of iron, but it was not iron; it felt smooth and cold as glass. we knelt, and we crawled forward, our hand groping along the iron line to see where it would lead. but there was an unbroken night ahead. what is the most likely explanation for the walls described in the bold text?

Do the certificate in a summer course give credits? if so, how many credits? and also, could you tell me which are the summer course and schools you know that give credits?

Castor et pollux, fratres, in multis bellis magna virtute pugnabant et multos hostes superaverunt. olim magna tempestas (storm) ad navem appropinquabat (came near), sed auxilio deorum discessit. tum nautae in capitibus castoris et pollucis duas stellas viderunt. "dei ipsi in capitibus fratrum has stellas posuerunt," omnes clamaverunt. "fratres boni sunt causae salutis nostrae! " postea acer hostis castorem interfecit et hic ad inferos (underworld) properavit (hastened). maximus dolor pollucem occupavit, sed is erat immortalis (immortal) quod filius dei erat. sine fratre suo pollux erat miserrimus et tristis. pollux ex patre deorum ipso oravit, "ego laetissime vitam meam," dicit, "pro fratre meo donabo." iuppiter autem dixit se castori unum diem vitae, polluci unum diem mortis donaturum esse. itaque locum fratrum cotidie (daily) mutavit. iuppiter duas stellas in caelo locavit. homines fratres geminos (twins) appellabant. do not use google i will not give you and i will report your question if you do use google translate. seventy points!