【单选题】Everyone has faced the embarrassing ______ of deciding how much extra to give a waiter or taxi-driver.
【判断题】压电材料的电场应变效应本质是由电致伸缩效应引起的。
【单选题】--- How much homework has your cousin finished? --- _______ at all. He has sat there the whole morning, doing _______.
【单选题】How much rice there in the jar?
【单选题】--___________has he been like this? --Ever since last week.
【单选题】It is mentioned in the passage that one has to pay tax according to ________.
A.
how much education one has received
B.
whether one is single or married
C.
how old one's children are