When you are swimming, ________ your ears. You can use earplugs (耳塞) to stop water getting into your ears.
When we practice English speaking, we often end up ______ in Chinese.
The teacher is doing a survey about _____ Japanese.
Dale’s parents are very strict ______ his study.
It’s ________ hard for us ________ understand what he said.
The children felt _________ because of the _______ result of the football match.