If you cannot have a good command of grammar as well as precise usage of each word you’ve learnt, it is ________ for you to use English flexibly.
The little girl who got lost decided to remain _________she was and wait for her mother.
Whenever I met her, _________ was fairly often, she greeted me with a sweet smile.
We are invited to a party _________in our club next Friday.
----John and I will celebrate our fortieth wedding anniversary next month. -----Oh, _________!