We are taught that a business letter should be written in a formal style _____ in a personal one.
He made such __________ rapid progress in his job that before long he turned __________ director of the department.
An unhappy childhood may have some negative effects on a person's character; however, they are not always __________.
-How about this type of mobile phone?-__________. I'd prefer a 3G.
Henry goes to a free class every Sunday afternoon which __________ at 4 pm.
The lecture,__________ at 7: 00 last night, was followed by an observation of the moon with telescopes.