-- In a text message, 88 means Bye-bye.-- And another example is F2F______ stands for face to face.
This is______difficult problem that few students can work it out.
.He lives_______in the______village, but he is never_______.
Pollution is a serious problem. Scientists have _______ some good ways to save it.
We can’t put off _____ a plan .
I saw himwhen I passed by.