Teachers have to constantly update their knowledge in order to maintain their professional ______.

(单选题)______ twice a year is the rule that every driver must obey. (单选题)Having studied Tom’s menu, I found many of the items are sim (单选题)The coach ______ the Lucy’s name on the race list yesterday (单选题)It was in 1969 ______ the two American astronauts got to the (单选题)Ann as well as her two friends ______ invited to the party t (单选题)It’s necessary to know what color looks good ______ your ski (单选题)The accident happened on such an evening with strong winds _ (单选题)There is no point advocating banning smoking in public _____ (单选题)______ is expected, according to the online survey, is that (单选题)As many houses were destroyed after the earthquake, the vill