The unprecedented drought did severe damage to the wheat harvest.

They were waiting for the go-ahead.

The former is better than the latter.

Many support the former alternative, but I prefer the latter.

The solution of one may prove to be the solution of the other.

We must make arrangements with them beforehand.

Reserve a seat in advance.

I would have set aside the day for it if you'd told me ahead of time.

Move up to the front, please.

Move along, please.