There are only ______ new wordsin the passage, but I know _____ of them.

Early experiences taught me not to be overly _ about shopping by mobile phone because there is a high risk of being cheated.

The spokesman was very ______ about expressing his opinions in public in case he might make mistakes.

Biology is my favourite subject.—Mr. Green teaches __________ Biology, I guess. He teaches so well.

The film started to get boring, at _____ point I leftthe cinema accompanied by my twin sister.