This kind of cloth feels _____ and sells_____.

Fred is second to none in English in our class, but believe it or not, he _____ passed the last exam.

The problem was very difficult to handle．We worked it out，__________ ．

All of us are_____aware of the cause of this failure, so do not make the same mistake again.

As is known to all language learners, the newly learnt words will soon be forgotten unless ______ used in everyday communication.