It's best ＿and bring these items with you ,but in an emergen

Red aerial minifalres are used by some boaters in an emergency.The flight of one brand of flare,when fired at an angle of 70 degrees to the horizontal,is modelled by the function:
h= -9(t-3)^2+ 83
where h is the height (m) and t is the time (sec),since the flare was fired.
a) For how many seconds does the flare burn before it hits the water?
请写出演算过程.

It dealt a telling blow to villeinage and led to the emergence of a new class of yeomen farmers.
这句话的中文意思.It dealt a telling 怎么理解.

这是面膜上的一段.麻烦高手给翻译下,谢谢! Bone glue zymogen emergen
cy mask
Anti-wrinkled,dilute the fine lines
Effective whitening and moisturizing

完形填空 急用···谢谢
完形填空
it was an unusually quier day in the emergency room on december twenty fifth.i was on duty when i saw a thin woman and four small children in 21___ clothing in the waiting room.
i went back to the nurses' station and 22___ we had a homeless family in the waiting room.the nurses,complaining about working christmas,felt 23___ for the family.the team went into 24___,much as we do when there's a medical emergency.but this one was a christmas emergency.
we held a 25___ for our guests seriously.we took 26___ joining the christmas *** in the waiting room.when it was my turn,i 27___ with them at the little banquet table we had created in the waiting room.we talked for a while about 28___.the four chidren were telling me about what they wanted to be when they grow up.the six-year-old said,"i want to be a nurse and help people".after the four children had 29___their dreams,i looked at the mom.she smiled,"i just like they are right now."
the"***"lasted most of the 31__.as they walked to the door to leace,the four-year-old came running back,gave me a hug and 32___,"thanks for being our 33___today."as she ran back to join her family,they all waved one more time 34___the door closed,i turned around slowly to get back to work,a little embarrassed for the 35___in my eyes.i worked a christmas day i will never forget.
21.a modern b worn c tidy d sensible
22.a mentioned b responded c found d thought
23.a passion b tension c sense d pity
24.a action b measure c anger d effect
25.a discussion b conclusion c *** d talk
26.a hands b turns c blame d control
27.a lay b sat c danced d moved
28.a hobbies b customs c diseases d dreams
29.a applied b adapted c shared d employed
30.a content b previous c strict d serious
31.a change b shift c theme d occasion
32.a explained b shouted c whispered d laughed
33.a teachers b parents c hosts d angels
34.a before b after c since d because
35.a tears b sands c images d flavors