Xét khai triển ${{\left( \frac{\sqrt{{{2}^{x-1}}}}{\sqrt[3]{2}}+\sqrt[4]{4}{{.2}^{\frac{x}{2}}} \right)}^{m}}$. Gọi$C_{m}^{1},C_{m}^{3}$ là hệ số của số hạng thứ 2 và thứ 4. Tìm m sao cho:$\lg \left( 3C_{m}^{3} \right)-\lg \left( C_{m}^{1} \right)=1$.
A. 7.
B. 6.
C. 2.
D. 1.

Một hộp đựng 7 bi trắng, 6 bi đen, 3 bi đỏ. Chọn ngẫu nhiên 3 bi, xác suất 3 bi lấy ra khác màu nhau là
A. $\frac{1}{560}$ 
B. $\frac{1}{16}$ 
C. $\frac{9}{40}$ 
D. $\frac{143}{280}$

Choose the best answer for the following sentence:
The boy learns hard in his ____________ to be the top in every exam, which will leave a good impression on his girlfriend.
 
A. try
B. attempt
C. way
D. wish

Choose the best answer for the following sentence:
“I’m looking for someone to help me get my car out of the snow.” “I _________ be glad to help you.” 
A. can          
B. should             
C. will                   
D. have to

Choose the best answer for the following sentence:
That's the businessman ___________ company is so successful.
A. whose
B. who's
C. whom
D. which

Choose the best answer for the following sentence:
___________ other boys of the same age who are crazy about computer games, my brother spends his free time experimenting in the lab. 
A. Like               
B. Alike                
C. Dislike                
D. Unlike

Choose the best answer for the following sentence:
A meeting held during the night is a _____________________________ . 
A. meeting night                  
B. nightly meeting 
C. night-meeting                 
D. nighty meeting

Choose the best answer for the following sentence:
He was happy. He __________ pass his driving test at the first attempt. 
A. should  
B. had to  
C. must  
D. was able to

Choose the best answer for the following sentence:
This is _____________ interesting exhibition I’ve ever visited. 
A. more                    
B. less                    
C. most              
D. the most

Choose the best answer for the following sentence:
This time next week Mike ___________ for me at the station.
A. will wait
B. will be waiting
C. waits
D. has waited