I found ___________ hard to remember all the twelve star signs because they are difficult to pronounce(发音) and spell.

After that, he knew he could _______ any emergency by doing what he could to the best of his ability.

What’s she doing _____vacation?—She’s _____.[ ]

It’s time _____ class. You must _____ the classroom.

Don’t forget it’ll be the first time ____ in public