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There is nothing wrong with using a credit card for purchases. It’s more _______ than carrying loads of cash.

A．convenient        B．valuable           C．sensitive          D．innocent

By the time a child is five, he _______ hundreds of hours of television.

A．will watch         B．will have watched   C．had watched       D．is watching

 _______ the house is empty, memories flood my mind of a time when it was filled with life.

A．Since             B．Unless            C．As if              D．Even though

The numbers that researchers get from the experiments can be _______, just like number puzzles.

A．disappointing      B．inspiring          C．worrying          D．confusing

Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.

A．while             B．or               C．for               D．so

The police say there is a $50,000 _______ for any information that helps them find the killer.

A．income           B．fee              C．bill               D．reward

We apologize for any inconvenience you _______ have been caused by the delay of the flight.

A．may              B．would            C．must             D．need

Parents should pay attention to areas _______ their child is having difficulty and spend extra time to help him or her master those skills.

A．a(chǎn)s               B．where            C．why              D．when

 — I suppose there’ll be a lot of arguments.

— _______

A．As you like.                            B．No problem.

C．That’s a good idea.                     D．I should imagine so.

All I’m hoping for is _______ wherever Michael is he will come home safe and sound.

A．whether          B．which            C．that              D．what