`1)` We had better not throw rubbish on the streets.
`2)` Our car will be serviced by a mechanic tomorrow morning.
`3)` Have you ever been to an English-speaking country?
`4)` I made lots of grammatical mistakes in my writing.
`5)` There was a typhoon in Nam Dinh Province last night.
$\text{Xin hay nhất ạ!}$