The electronic red-packet has been so ______ that AliPay and Tencent Wechat compete against each other openly and secretly since the beginning of this year.
He left the key ______ he had been an hour before.
You have no idea how she finished the relay race ______ so much.
It was from only a few supplies ______ she had bought in the village ______ the hostess cooked such a nice dinner.
The bell ______ the end of the period rang, ______ our heated discussion.
I used to drink a lot of tea but these days I _____ coffee.