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is changed；is looked is changed；looks has changed；is looked has changed；looks
used to be, change used to be, changed has been, has changed is, has changed
LiF（200）、LiF（220）、Ge（111）、PE（002）、PX1 LiF（200）、LiF（220）、Ge（111）、PE（002）、PX2 LiF（200）、LiF（420）、Ge（111）、PE（002）、PX1 InSb、LiF（220）、Ge（111）、PE（002）、PX1
it promotes family unity it helps them develop their speaking ability it affects their life in many ways it challenges society
TV as the sustainer of American life TV as the major transmitter of culture the educational effect of TV on society the strong influence and the poor quality of American TV
did the city change the city has changed has the city changed the city changed
be critical but entertaining be educational and creative change with the development of society attract as many viewers as possible
has changed ; well changed ; good has changed ; better changed ; better
improved the sound effect of television news. initiated a shift of emphasis to international politics. confirmed what Shakespeare said long ago. changed the way television news is handled.
changed; got married changed; has been married has changed; got married has changed; has been married
critical praising doubtful. sympathetic
advertisers are interested in experimenting with new ideas it is still at an early stage of development, compared with the radio the programs have to be developed in the interests of the sponsors for economic reasons it is controlled by radio companies
did the city change the city changed has the city changed the city has changed
used to be , change used to be , changed has been , has changed is , has changed
is changed was changed had changed has changed
has changed have changed has change changed
has changed has been changing was changed is changed
had Hefei changed Hefei has changed has Hefei changed Hefei had changed
has changed ; well changed ; good has changed ; better changed ; better
LiF能降低电解质的初晶温度 LiF能提高电解质的导电度 LiF能提高电解质中AL2O3的溶解度 LiF能使电解质密度降低
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