填空
Look _______ the thick crowd.
Please watch ________. The bus is coming.
选词填空
It's not______(safe/dangerous) to push around in a thick crowd.
It's _________(safe/dangerous) to skate on thin ice.
看图填空
No _______.
根据上下文填空
Don't fly your kite here. It's not _______. It's dangerous.
根据图示填空
Watch out _______(for/on) your safety.
I may fall _______(to/into) the water and get drowned.
