—I wonder why he has been acting so strangely these days.—Recent pressure at work may ____ his behavior.
______ at failing in the math exam, John wouldn’t like to talk about it to his parents.
The form cannot be signed by anyone ______ yourself.
Some plants can take in carbon dioxide we breathe out and give ______ oxygen to us.
— If you like I can do some shopping for you.— That’s very kind of you for your ______.
It’s no longer a question now ______ man can land on the moon.