下列图示实验操作，正确的是（ ）
A．检查气密性B．检验O2是否集满
C．收集H2D．稀释浓H2SO4
Our Chinese teacher is so _________that each students likes her．（ ）
patient
lucky
shy
busy
Don't use your mobile phone when you go _________the road． It's dangerous．（ ）
through
over
into
across
Bob， when will you help me do a survey， today or tomorrow？
________ is OK． I'm free these two days．（ ）
Both
None
Either
Neither
It's a pity that we'll have no _______to watch the Olympics in Tokyo， 2020．（ ）
choice
chance
reason
place
I plan to go to the Liaoning Museum， but I'm not sure ．（ ）
how I can get there
how can I get there
how I could get there
how could I get there
检查气密性B．
检验O2是否集满
收集H2D．
稀释浓H2SO4
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