He was finally admitted to BeijingUniversity. Never in all his life ______ so happy.

Could you lend me your pen —Of course. I have two,and ______ of them write well.

Without my glasses, I couldn’t _______ whether that figure on the blackboard was a three or an eight.

－My parents always warns me ______ with fire.－They are right. It’s dangerous.

was very busy, and________he didn’t go to the party that night.