I'm so sorry because I couldn't send.

1.time is money. This means that time is invaluable and effective, so we shouldn't waste time on trifles.
2.a stitch in time saves nine. This means that not to fail, you should arrange in advance.
3.There 's no time like the present. This means that now is the best opportunity.
4.Let's meet at four. If I'm not there by five, leave without me at six, and I'll be there at seven. This means that good timing is not decided by ourselves. However good timing is surely there.