above all - most importantly
account for - explain
as a matter of fact - in fact ,to speak the truth
as a rule - generally ;normally
about to - be ready to;be on the point of doing something
an old hand - be an experienced persom
any day now -soon
approach sb -talk to sb
be fed up with - be out of patience with
be on one’s own - live independently
be on the safe side - take no chances
be out of something - have no longer in supply
be tired of - be bored with ,frustrated with
be up to ones’ears - be extremely busy
be up to someone -be a person’s responsibility
be out for -trying to get
be out of the question - be unacceptable ,impossible
bite off more than one can chew - take on more than one can handle
上述就是部分托福口语高分词汇汇总，对于不熟悉的词组建议大家认真学习，多练习、多总结。