These teenagers don’t know much of the world yet; that’s why they are so easily _________ .
“Shall we stop for lunch _____ shall we drive on?”“Let’s stop for lunch, but the driver can’t drink _____ drive.”
Shelly had prepared carefully for her English examination so that she could be sure of passing it on her first ________.
Only after reaching eighteen join the army.
The students on the professor’s lecture now and then.
The house built of stone lasts longer than ____ built of wood.