_____(safe) must be ______(first)

_____(safe) must be ______(first) what must you do to be safe? 适当形式填空 We must consider their _____(safe) it must be _____(interest) Be _____（safe）应用哪种形式? 适当形式填空 We must consider their _____(sale)是safe we must pay attention to the _____(safe)when we take the plane 变反意疑问句You must be joking,_____? I think he must be a teacher,_____ _____. Be safe!是什么意思? As long as you drive _____,you will be very safe.(填空）为什么填 carefully? There must be someone living here[同义句转换]There must be someone ______ _____ here .It’s not here .It must be _____ ( anywhere ) there you must _____(be) on time next time. we must _____(be) quiet in the library. It must be _____(fun) to climb mountain 反疑问句 There must be something in the bag _____?. Action must be _____ to stop further pollution.