— Why didn’t you try your best to get on the subway? — I tried to, but it started moving ______ I could get on it.
----Do you know_____ second-hand smoke? ----To prevent our health and memory.
---- Will you buy this tie for Dad? ---- I have no idea. I don’t know or not the colour matches his new shirt.
The child is too young to_________ himself.
You can never imagine what great difficulty I have _________ your house.
----I wonder if your father _______ you to go swimming.----I’m not sure. But I will tell you if he _______ to let me join you.