_____ puzzles me most is that I don’t know ______ the difference between the two lies.
. .QQ,______you can chat with your friends, makes communication easy.
. Mike must be angry with me, for he walked me without even saying hello.
. _____ you don’t lose heart, I’m sure you can pass the coming examination.
. My house is the one with a red roof on the street. It ____ and you can find it easily.
. ----You must find one exam after another very tiring. ---- ________. In fact, they offered me good chances to apply what I had learned.