John and I___friends for eight years.We first got to know each other at a Christmas party.But we_____ each other a couple of times before that.
It wasn’t until nearly a month later ____ I received the manager’s reply.
As is known to all language learners, the newly learnt words will soon be forgotten unless______ used in everyday communication.
The child asked his mother _______ go out to play tennis.
When changing lanes, a driver should use his turning signal to let other drivers know _______.
After dinner they talked about the persons and things _______ they still remembered.