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--- How did you pay the workers?     --- As a rule, they were paid ______.

The waterfall can be seen _ __. Its sound may be heard __ two miles. It looks even more beautiful____.

. It is necessary for us to learn _____ second language ____ our mother tongue.

You must be strict with your children _____________.

Today Xiao Li is absent ___the class. He ___ ill.

___ repeated promises that the product is safe, many people have stopped buying it.

The Spring Festival is ___ us and we have a lot of things _____.

I won’t give you any help ___ you tell me the truth. It’s none of my business.

.Every time I express an opinion, he always argues ____ me ____ it.

. Many great men rose from poverty, Lincoln and Edison ____.