There is so much noise in the yard that I can’t ______ my attention on my work. [ ]

Would you like to go and buy some food with us —- ____, but I’m busy.

No offence, but I want to say that the driver is not the one____ for the accident.

How long do you think_____the computer company brings out a new product?[ ]

_________is very interesting to swim in the river in summer,but it’s dangerous.