Small sailboats can easily turn over in the water ______ they are not managed carefully.
| A．though | B．before | C．until | D．if |
We’ll be traveling by ________ camel across the desert before we go to ________university.
| A．/; the | B．the; / | C．/; / | D．the; a |
We all know that the Spring Festival is _____ special holiday when _______ whole family get together.
| A．the, the | B．a, a | C．the, a | D．a, the |
The tourists were struck by the beauty of _________ nature and then they stayed for _________ third day.
| A．the; the | B．/; a | C．the; / | D．/; the |
I think ___ good knowledge of English is ___ great help when you are traveling around the world.
| A．X，a | B．a，a | C．a，the | D．a，x |
I think it is _____ waste of time to play games on ____ Internet all day long.
| A．a ; a | B．the ; / | C． a ; the | D． the ; the |