－So far, we __________ over 2,000 English words.－Really But I can’t remember all of them.

me parents, the Internet can seem like a jungle, ______danger for their children．

It was______ she went back home______ Kate realised she had left her schoolbag at school.

_____ the cost, that hat doesn’t suit me[ ]

Why was the Great Wall built?-To ________ against enemies.[]