celebrate Christmas.
honor your parents!.
I cannot keep track of all my employees.
Keep an eye on the baby, please!.
keep appointments.
keep count.
Keep the commandments.
Observe Yom Kippur.
Please observe the reaction of these two chemicals.
She detected high levels of lead in her drinking water.
She followed the men with the binoculars.
she never keeps her promises.
She observed that his presentation took up too much time.
Take note of this chemical reaction.
The pianist kept time with the metronome.
The world is watching Sarajevo.
They noted that it was a fine day to go sailing.
We found traces of lead in the paint.
We kept to the original conditions of the contract.