He spent too much time talking on ______ phone while we were all busy at _____ work.

It doesn’t matter ________ you pay by cash or credit card in this store [ ]

20.You have to have a good preparation for the exam__________ you can do well in it

On the east of the city ___a museum , inwhich many ancient things are on show.

You’d better write down her address before you ________ it.