Laura bought her first smartphone five years ago.
HAD
Laura .................... five years.
If you do not update the software, the computer will not work properly.
UNLESS
The computer will not work .................... the software.
It is a pity I cannot afford the new laptop.
COULD
I .................... the new laptop.
No matter how hard I tried, I could not fix the printer.
THOUGH
.................... hard, I could not fix the printer.
They say that this app is the best for learning languages.
SUPPOSED
This app .................... the best for learning languages.
He decided to delay sending the email until the morning.
PUT
He decided to .................... email until the morning.