John’s ability to learn from observations and experience _______ greatly to his success in public life.

Because I’ll be very busy this weekend , I’m afraid I had to ____ to take part in the party 

Dear, I hope the engine will ______ until we get to the next garage.

I forgot his phone number that day.I had to ___ the phone book to find it. 

You needn’t write on __________ line. You can write on __________ line.