---I’m afraid I must be off now . --- ____________________ .
To avoid on how to use the word, you’d better refer to a dictionary.
There is a shortage of teachers in Western China, and it will fall on the 80s and 90s generations to this responsibility.
Only when he told me________what trouble he was in.
There are a number of methods to provide relief from your toothache, which can’t cure the problem.
____ I'm mistaken, I've seen that tall man at a party before.