It’s hard to believe____ the way out of the forest without the help of the local guide.
| A．what they were able to find |
| B．what were they able to find |
| C．how they were able to find |
| D．how were they able to find |
You must ______ that the power is off before you leave the lab.
| A．check | B．know | C．decide | D．examine |
At such gatherings, people ______ are not necessarily your relatives or friends.
| A．that you say hello | B．who say hello to |
| C．you say hello to | D．whom you say hello |
—We’d better go downstairs right now for lunch.
—______ They serve food 24 hours a day.
| A．Take your time. | B．No way! |
| C．Hurry up! | D．It doesn’t matter. |
Walking is a nice way to relax. ______, it can help reduce body weight if you do it regularly.
| A．However | B．Instead | C．Therefore | D．Besides |
Having decided to take the trip, he ______ preparing for it.
| A．set up | B．set about | C．set out | D．set aside |