Correct the prepositions in the sentences below. In some sentences, there are no mistakes.

Write the correct word in each gap. Write ok if the sentence is correct.

The latest gadget was very popular, and the product went away of stock within hours. [ ]

Trendy clothes are usually in demand. [ ]

Save up money instead of buying things you don't need. [ ]

Should I pay under card? [ ]

Don't take pride at your shopaholism. [ ]

When will this new smartphone be in sale? [ ]