Kitty sometimes eats ______ orange or some grapes after lunch.

A．anB．aC．theD．/

The Communist Party of China will have its 100th birthday ______ July 1，2021.

A．inB．onC．forD．at

—Mum，where is David？

—He ______ to see the science fiction film Back to the future.

A．is goingB．goesC．has goneD．was going

This year's Beijing Music Awards will be covered ______ on Sunshine TV this Saturday.

A．livelyB．aliveC．livingD．live

Mary shut the window just now ______ she could keep the insects out.

A．so thatB．whenC．tillD．after