(If) it receives (enough) rain at the proper time, hay (will grow) quickly (as) grass.

单项选择题In order for one to achieve the desired results in this experiment, it is necessary that (he) (work) as (lastly) (as) possible.

单项选择题The differential attractions of the sun and the moon (have) a direct effect (in) the (rising) and falling (of) the tides.