—I’m just phoning to wish you good luck in your exam tomorrow.
—_ __.
| A．Thanks. I can’t wait to go |
| B．Thanks. I can’t believe it’s been 5 years. |
| C．Thanks. We’re really happy! Everything went wonderfully |
| D．Thanks. We’re a bit worried about it actually |
It is believed that forest bathing ______ strengthen the immune system.
| A．should | B．must | C．need | D．can |
As long as the laws of nature ______, there will be tornadoes.
| A．exist | B．are existing | C．will exist | D．existed |
North Korea fired a long-range rocket last month, but the launch was reported ______ in failure.
| A．to end | B．to have ended | C．having ended | D．ending |
Some scientists have questioned the theory ______ CO2 is causing dangerous global warming.
| A．which | B．what | C．that | D．why |
They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.
| A．has happened | B．happened | C．had happened | D．has been happening |