Scientists say it may be a few years ______ it is possible to test the new medicine on patients．
| A．because | B．after |
| C．since | D．before |
My parents often tell me _______ too much junk food. It’s bad for my health.
| A．not eating | B．don’t eat | C．not eat | D．not to eat |
–Have you ever _______ to Singapore?
–No, never.
| A．are | B．were | C．was | D．been |
–How are you today, Francis?
–Much _______, but my doctor says I’ll still have to rest for another few days.
| A．well | B．good | C．better | D．best |
–Hi, Bruce! I haven’t seen you for such a long time. It _______ that you’ve changed a lot.
–Yes, time flies!
| A．says | B．looks | C．seems | D．makes |
--How many boys _______ in your group?
--Four.
| A．are there | B．is there | C．there are | D．there is |