With some technical problems to be solved, it may be a while the system is put into use.
| A．when | B．after | C．since | D．before |
There is clear evidence ______ the most difficult feeling of all to interpret is bodily pain.
| A．what | B．if | C．how | D．that |
Did you predict that many students ______ up for the dance competition?
| A．would sign | B．signed | C．have signed | D．had signed |
At one point I made up my mind to talk to Uncle Sam. Then I changed my mind, ______ that he could do nothing to help.
| A．to realize | B．realized | C．realizing | D．being realized |
One of the most important things in education is to let students ____ positive emotions and experience in the process of their learning.
| A．require | B．acquire | C．demand | D．clarify |
––– I felt left out at the party last night.
––– Really? ____, you should have said something.
| A．If possible | B．If so | C．If necessary | D．If any |