Millionaires are often very generous and __a lot of their money to charities to help the poor.

Both Class 3 and our class won’t be able tofinish the work unless they ___ each other.

Time is the thing _____ never comes back. We should make full use of it.

The salesman spent two hours trying to persuade my mother ________ their products.

When asked why he did so,he remained_______all the time. [ ]