You can get the best result ______you carry out the experiment under the desired conditions.
| A．what if | B．even if | C．only if | D．as if |
Last month, the Japanese government expressed their thanks for the aid they ______ from China.
| A．receive | B．had received | C．have received | D．are receiving |
If you _____ smoke, please go outside because this is a non-smoking office.
| A．must | B．should | C．can | D．may |
––Who would you rather _____ your graduation ceremony tomorrow, your parents or friends?
––All of them.
| A．will have attended | B．have attended | C．attended | D．to attend |
In that school, English is compulsory for all students, but French and Russia are ____ .
| A．special | B．optional | C．regional | D．original |
––Why didn’t you come to the party?
––I had meant _____, but something unexpected happened.
| A．so | B．that | C．not | D．to |