1 . I can’t go to the party tonight, ________ I have to work late.

A．even though

B．as if

C．in that

D．ever since

2 . Try to give yourself some extra time for each task ________ one takes longer than you expected.

A．in case

B．even if

C．so long as

D．as if

3 . Potatoes reached Belgium in the 16th century, but they weren’t cut up into fries and sold as a meal ________ the 19th century, ________ they became popular.

A．since, that

B．until, when

C．after, when

D．when, that

4 . I’ll see you at the theater        you call me to say you’re not coming.

A．because

B．unless

C．since

D．if

5 . Please ensure you have a backup of all your documents ________ the system upgrade encounters unexpected issues.

A．even if

B．as if

C．ever since

D．in case

6 . ________ modern technology can grow more crops, the terraces are still important to local s who value their traditions.

A．As if

B．In case

C．So that

D．Even though

7 .           parents want to stay involved and informed about their grown-up children, they must establish boundaries and help them to be independent.

A．Because

B．Unless

C．While

D．Once

8 . It was reported that many high buildings were put up         there used to be a desert, which made some foreign experts amazed.

A．when

B．where

C．how

D．what

9 . ________ the only way to the mountain has been blocked by snow, we have to wait till it clears up.

A．As soon as

B．Even if

C．Now that

D．As long as

10 . Scientists hope to learn more about this plant warning system, ______we can use it to grow crops without pesticides.

A．in case

B．even if

C．as though

D．so that