— Why do you drink so much tea? 

— Well, _____ it doesn't keep me awake in the nights.[ ]

A. although

B. as soon as

C. as long as

D. while

( ) “There’s a motorcycle coming" is seen as, out of context, a statement that a motorcycle is coming. But in a particular context, it might be a warning to a pedestrian not to step onto a road. When the study of meaning is considered in the context of use, it becomes a branch of linguistics called pragmatics.