He is __________ failure as __________ English teacher.
They _________ have arrived at lunchtime but their flight was delayed.
China is one of the countries ________ the Mekong River flows.
He was _________by his colleagues though he himself didn’t think he had done anything special.
It was reported that a chemical factory________ last night, which killed thirty workers.
The exhibition is well worth ________ and you can see fancy vases of different dynasties on show there.