_____ have you studied English? —For five years. [ ]

The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.

This is _____interesting work. We really enjoy it.

Could you please tell me _____ tomorrow?- At 8 o’clock.

We’ll be back for our school’s _____ anniversary ceremony(周年庆典). –I see. That means you’ll have a get-together with your classmates in ___ years.