__ they were not rich, they tried their best to send their child to the best school.

I’ve got so many problems ______ today that I’m afraid I won’t have time to have lunch. [ ]

The manager devotes all his spare time ______ the violin.

travel can broaden your mind, I don’t think it’s a good idea to spend too much time and money on it [ ]

It’s not bad manners to play a trick ____ your friend on April Fool’s Day.