Scientists say it may be five years ______ it is possible to test this medicine on human patients．
| A．since | B．until | C．before | D．when |
He said＿＿＿＿＿his sister had passed the entrance examination of college, and＿＿＿＿＿she would go to college in about 20 days.
| A．that；／ | B．that； that | C．／；／ | D．that； which |
—— Would you like some wine?
—— Yes, just ＿＿＿＿＿.
| A．little | B．very little | C．a little | D．little bit |
＿＿＿＿＿ it rain tomorrow, we would have to put off the visit to the Yangpu Bridge.
| A．Were | B．Should | C．Would | D．Will |
He broke his legs while ＿＿＿＿＿.
| A．riding | B．ride | C．was riding | D．rode |
If you go to Xi’an, you will find the palaces there more magnificent than commonly＿＿.
| A．supposing | B．supposed | C．to suppose | D．suppose |