1)-So how long would you think it'll be before I can go back to work ,doctor

1)-So how long would you think it'll be before I can go back to work ,doctor
-Well,you () be feeling much better by the next weekend .
A)should B)would
2)-Did you attend the French short training course last summer
-No .But I'll () it this summer .
A)be attending B)have attend C)have been attending
3)All the songs () at the xonxert should be original .
A)to be sung B)being sung
4)Changing from solid to liquid ,water takes in heat from all substances near it ,() produces artificial cold surrounding it .
A)which B)that C)it