Eye doctors recommend that a child's first eye exam ________ at the age of six months old.
We meant to finish the work by dark, but we were so tired that we could not ______.
We are interested in the weather because it ______ us so directly---- what we do and even how we feel.
Sitting in the shade on this hot day ________ good.
Once he makes a promise, he will ______ it.
My mother always tells me not to forget to ________ my umbrella when I leave for work.