______ the police thought he was the most likely one, since they had no exact proof about it, t hey could not arrest him.
____ she couldn’t understand was _____ fewer and fewer students showed interests in her lessons.
______ surprised the family most was ________ the girl played basketball very well.
Someone is ringing the doorbell. Let’s see _______.
It is very common that former people have difficulty in _____ modern life.
I really don’t know ___ ___I kept the secret papers.