＿＿＿＿＿ it rain tomorrow, we would have to put off the visit to the Yangpu Bridge.
| A．Were | B．Should | C．Would | D．Will |
Great as Newton was, many of his ideas _______ today and are being modified by the work of scientists of our time.
| A．are to challenge | B．may be challenged |
| C．have been challenged | D．are challenging |
Some passengers complain that it usually _________so long to fill in travel insurance documents.
| A．costs | B．takes | C．spends | D．spares |
Xi’an is really a fascinating city and we’ve decided to stay for two weeks.
| A．another | B．other | C．the other | D．other’s |
His parents were teachers in that school, _______ lost their lives in order to save
their students in the earthquake.
| A．none of them | B．both of them | C．none of whom | D．both of whom |
______ he referred to in his article was unknown to the general reader.
| A．That | B．What | C．Whether | D．Where |