Tom is weak in physics. He always feels _______ before he takes a physics test.
Suddenly, they heard ______ whisper from the bushes behind _______tree on the left.
—Do you like to sleep with the windows ________?—Yes, I’d like to feel the air and wind.
---Can we swim in the river?---_______. It's dangerous to swim here.
There is a_______ tree in front of my classroom
The exchange_______ homes are in the UK. I want to take_______ to the Great Wall.