We'd better ________when he is thinking，as he prefers to solve problems on his own．（ ）
| A． |
let him down |
B． |
cheer him up |
| C． |
leave him alone |
D． |
ring him up |
﹣ Come and see! The baby is crying．
﹣Please do something to make him ____．（ ）
A．stop cryingB．stop to cry
C．cryingD．cry
The passenger refused to move after taking another one's seat!
What a shame! He ____ according to the newly credit system（诚信体系）．（ ）
A．punishB．punishcd
C．will punishD．will be punished
Listen! Is Sarah singing in the neighbor's room？
No． It ____ be Sarah． She has gone to Italy．（ ）
A．needn'tB．may notC．can'tD．won't
Have you ever heard that China is building a nationwide 5G network？
Right． 5G will allow us ____ English movies faster than ever．（ ）
A．downloadB．downloads
C．to downloadD．downloading
Jimmy， the books are everywhere in your study．
Sorry， Mom． I'll ____ at once．（ ）
A．put them onB．put them away
C．put them outD．put them up