______ is well known to everyone, I should say, is that a man becomes learned by asking questions

Evidence has been found through years of study______children’s early sleeping problems are likely to continue when they grow up.

Don’t forget thanks when other people help you.

Where’s your father, Tom— He _________ to Changsha.

135. Whoever spits in public in Beijingwill be fined up to 50 yuan in _______ effort to improve citizens’ behaviorahead of ______ Olympics.