Gary’s mom warned him not to _______ the glass.

蓋瑞的媽媽警告他不要勿＿＿玻璃。

Explanation

break (v):
to cause something to separate into two or more pieces
打破：使某物件分成兩個或以上的殘片。
Sherry dropped her glass and broke it. .
雪莉把她的杯子摔了，把它打破了。
brake (v): to cause a car or other vehicle to slow down or stop
煞車：使汽車或其他的交通工具減速或停下來
Miss Adams always brakes when she sees children near the road.
亞當斯小姐每當看到有兒童出現在路邊，就會煞車減速。