--Would you please explain to me about the difference between the two phenomenon?
--I’m sorry, but that’s just _____ I’m puzzled about.
| A．why | B．what | C．which | D．where |
The school rule states that no child shall be, unless _by an adult, allowed out of the school during the day.
| A．to be accompanied | B．accompanying |
| C．accompanied | D．being accompanied |
Stephen Hawking believes that the earth is unlikely to be the only planet life has developed gradually.
| A．whose | B．where | C．which | D．what |
What a pity! When we got to the cinema, the movie Let the Bullets Fly _________, so we saw only the end of it.
| A．was finishing | B．has just finished | C．just finished | D．had just finished |
No matter how low you consider yourself, there is always someone looking up to you ___
they were that high.
| A．to wish | B．to have wished | C．wishing | D．having wished |
________ a child begins school, he enters a world of fierce competition where success and failure are clearly defined and measured.
| A．Before | B．Until | C．Whenever | D．The moment |