In hot summer, milk quickly turns sour it is refrigerated.
A．while B．if C．until D．unless
He found himself by a crowd of excited people and to escape.
A．surrounded; trying B．surrounding; trying
C．surrounding; tried D．surrounded; tried
---John, why are you so upset?
---I my cell phone all morning but it is nowhere to be found.
A．am looking for B．have looked for
C．have been looking for D．had looked for
- A lovely day, isn’t it?
-- Yes. I love when the weather is like this. Why not have our lunch outside?
A．this B．it C．one D．That
If people eat natural plant poisons by mistake, they _______ go to hospital without delay.
A．would B．can C．may D．must
My mother _______ a bed in the sitting-room for my cousins from the countryside.
A．brought up B．took up C．made up D．put up
