I’m sorry I didn’t answer your call because I ______ music.
listen to
listened to
was listening to
am listening to
_____ great scientist Qian Xuesen is!
The moonlight goes _____ the window and makes the room bright.
Teenagers should learn to protect ______ from all kinds of danger.
With the help of the Internet, information can ______ every comer of the world quickly.
It can’t be Lucy’s bike. Look! ______ is under the tree.