Trio Rio Cento

[from Daily Telegraph letters praising Team GB, 17/08/16;
only one word/phrase per letter per poem]

Rio Cento I

beastly

small

frustrated

late

Britain is back

quite

Rio Cento II

it is remarkable

the times

we have to endure

Rio Cento III

unrelated to the Olympics

I am wondering

why

my right thumb has grown considerably

Bonus Rio Cento

Rio has never been more annoying

like one of those things one puts in a fish tank