44. He must be getting thin, for his trousers _____ badly like a flag in the wind.
— Dad, I’d like to go to the cinema with you. — Sorry, dear, but the film is _____ adults only.
I don't think the experiment is _____ failure. At least we have got _____ experience for our future work on _____ nature.
.He is really an excellent doctor and he is _____ to becoming an expert in this field.
The boy student is poor in health now; his parents wish that his health _____when he grows up
Don’t enter the office unless _______.