請指導括號內的字是否正確......謝謝!

11.I can't ask you to dinner this week as I am (have to)my house painted at the moment.
12.His fruit was stolen before he (had) a chance to pick it .
13.You (had better)fly than taking a train.
14.If you give all-night parties you'll ( have) the neighbours complaining.
15.Do you (have) earthquakes in you country?
16Can you help me now? Do you (have) time?
17.I can't answer the telephone; I am (have ) a bath.
18.They are (have ) a party the coming Saturday night.