The space walk will last six and a half hours and the repair of Discovery is expected to __________ a little more than an hour.
| A．take | B．cost | C．spend | D．adjust |
Many students today suffer from ________ problems, since they are under too much pressure.
| A．recreation-related | B．pollution-related |
| C．stress-related | D．pollution-free |
________ energy is generated from natural resources—such as sunlight, wind, rain, tides and so on.
| A．Recyclable | B．Non-renewable |
| C．Rechargeable | D．Renewable |
Effective measures have been taken to prevent _______pollution.
| A．exhausted gas | B．exhausting gas |
| C．exhaust gas | D．exhaustion gas |
-- I’m thinking of the test tomorrow. I’m afraid I can’t pass this time.
-- ______! I’m sure you’ll make it.
| A．Go ahead | B．Good luck |
| C．No problem | D．Cheer up |
After that, he knew he could ________any emergency by doing what he could to the best of his ability.
| A．get away with | B．get on with |
| C．get through | D．get across |