Please _________ the tigers. It’s dangerous to take photos with them.—Oh, I see. Thank you.

_________ my two sisters. And __________ my brother.

During the entrance exam，there are___________ parents waiting for their children outside the test centre.

Simon, don’t give up easily. It’s ______________ to lose the chance. –Thanks. Your suggestions are ___________.

The global warming is more and more serious, for which human beings ______．