Translate ancient Chinese sentences! ! !

I'm afraid that if Qin Cheng wants to give it to Qin, he will be cheated in vain.

Do you want to give it to Qin, but you are afraid that Qin will raise troops to fight.

Qin wanted to exchange the city for Cui, but Zhao refused.

Zhao gave it to He Shibi, Qin did not give it to Zhao (Xu Du), and the loss was in Qin. To measure these two options, it is better to promise Qin and let Qin be indefensible.