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"http: / / www. / yutai / beidong / _blank ) Visitors ___________(request) not to touch the exhibits. 2)was/were done 一般过去时 I ___________(give) ten minutes to decide which I should choose. 3)has /have been done 现在完成时 ( http: / / www. / shitai / xianzaiwanchengshi / "
"http: / / www. / yutai / beidong / _blank ) All the preparations ___________ (complete). 4)had been done 过去完成时 ( http: / / www. / shitai / guoquwanchengshi / "
"http: / / www. / yutai / beidong / _blank ) By the end of last year, another new gym ___________ (complete) in Beijing. 5)am/is /are being done 现在进行时 ( http: / / www. / shitai / xianzaijinxingshi / "
"http: / /
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