Câu hỏi:

My sister hair isn't _______

Our energy will soon come to an end if we don’t__________ it.

The children like to put ___________ nice clothes when they go out.

Of course as a student I want _____ all the exams.

Please turn __________ the gas. I want to cook my lunch.

If there is a mechanical problem, we suggest ______ the manufacturer directly.

What _____ of learning English do you find most difficult? Is it grammar rules or speaking?