—Susan, can you help me clean the window?—Why_______? Alice is sitting there doing nothing.
--- Mr green, ________can we do to protect ourselves when facing dangerous attackers in public places?------Always remember “run, hide and fight” when you are in danger.
______of the water_____polluted. We must try to protect our environment.
----Pardon? I didn’t hear you just now.---- I asked_______________________.
The stones are so heavy. How _____ they _____ to the top of the building without modern machines?
No free plastic bag in the supermarket helps to _____ white pollution.