When you are planting trees, the trees ________ straight in the hole.

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.

Do you know the answer_____ the question? [ ]

Simon, Kitty says she a comic book in your home yesterday.

What’s the noise ? It sounds as if it comes from upstairs. –______. It must be the window-cleaner working , next door.