I ______ _____ the computer ______ six months.

82.Remember to ring me up as soon as you get to Beijing.

Don’t _______ to give me a ring as soon as you _____ ____ Beijing.

83.---I’ve never been to an aquarium.---I haven’t, either.

---I’ve never been to an aquarium.---______ ______I .

---I’ve never been to an aquarium.---______ ______.

84.The price of the shirt is really low.

The shirt _____ really ______.

85.You should work out the problem alone,Tom.

You should work out the problem _____ ______,Tom.

86 Lucy left school half an hour ago.

Lucy has ______ ______ from school for half an hour.

87.There are 30,000,000 people in that country.

The _______ of that country _____ 30,000,000.

88.Mr Smith isn’t here. He went to the library.

Mr Smith _____ _____to the library.

89. Yesterday he walked here instead of driving here.

Yesterday he walked here _____ _____ drove here.

90.He saw nobody in the room.

He _____ see _____ in the room.