________with so much trouble,we failed to complete the task on time.
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.
Only when he reached the tea-house _________ it was the same place he’d been in last year.
She’s having a lot of trouble with the new computer, but she doesn’t know whom to _______.
The time he has devoted ______ the disabled is now considered ________ of great value.