—I really don’t know whether I should tell my father about the exam.
—Well, don’t speak until ________.
| A．speaking | B．spoken to |
| C．spoken | D．speaking to |
_______ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B．As far as | C．If only | D．So long as |
--How do you think I can make up with Tom?
---Put aside_____ you disagree and try to find_____ you have in common.
| A．what, what | B．where, what | C．what, whether | D．where, whether |
________, his idea was accepted by all the people at the meeting.
| A．Strange as might it sound | B．As it might sound strange |
| C．As strange it might sound | D．Strange as it might sound |
Between the two periods of classes is a break, _______ we can have a short rest.
| A．then | B．where | C．when | D．which |
---The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?
---____ my students have a try?
| A．May | B．Must | C．Will | D．Shall |