I’m told that languagepractising．com is a free website _______learners can not justlearn various languages but also chat online．

May I trouble you with the question -Sorry, but it is______ my knowledge.

Does the machine(药) make you ________

Hi Mary. What are you doing now Let‵s go to the park.—Sorry，my mom asks me to _____because my room is too dirty（脏的）

Mr. Smith had taught for many years, and all the students him.