You have to be accurate in this job，because a small mistake can make a big ________.
| A．difference | B．difficulty |
| C．trouble | D．change |
He studied as hard as he could _____ to enter a good college.
| A．hope | B．to hope | C．hoping | D．hoped |
He was in great need of money, so he _____ $5, 000 for his car.
| A．paid | B．took | C．cost | D．spent |
I think the doctor is able to care of _____ is the matter with your son .
| A．all | B．what | C．whatever | D．anything |
He has read the book as many as, if _____ than, five times.
| A．no more | B．not more | C．no much | D．not much |
Let us not waste ______ time we have left .
| A．the little | B．little | C．a little | D．a little more |