The hall is too noisy. The speaker has to raise his voice to make himself ________.A.hear B.heard C. to hear
Stop ______ about the traffic. Just think about what we can do to improve it.
I can't connect my computer to the Interrnet. There must be ______ wrong with it.
Mr. Li asks the students ______ in the river, because it’s too dangerous.
interesting subjects they are !
To live a green life, we should try to save ____ energy and produce__pollution.