It has come to be realized ______ particular matters in the air expose us to life’s real danger.

A. what      B. which          C. when               D. that

 ______ you’ve tried it, you can’t imagine how tasty the fish I cooked is.

   A. Because         B. Unless        C. Although             D. So long as

 Evidence has been piled up ______ drinking water before breakfast is good for our health.

A. what             B. which               C. if            D. that

 Now it’s been possible for us to be taken into “space”, ______ we can experience weightlessness for a short time.

A. which            B. when               C. where               D. that

 Wise people have focused the process rather than the result as it is in the process ______ we learn and grow.

A. where            B. in which         C. that            D. from which

 The manager will put ______ he thinks has a strong sense of duty in the leadership position.

A. anyone           B. whoever      C. whomever           D. who

 ______ a little money from her pocket money, Alice was able to buy her mother a lovely scarf.

   A. To save          B. Saving               C. Saved        D. Having saved

Judging from the date _______ on the gold coin, we can tell that it was made 500 years ago.

A. being marked 　 B. marked　　　 　　　 C. to mark 　　　　 D. to be marked

 ______ in a top-level university abroad is what many students wish for.

   A. Educated      B. Being educated   C. To educate D. Educating

 ______ the burden of carrying heavy school bags, some schools introduced iBooks a few weeks ago.

A. Eliminating         B. Eliminated     C. To eliminate     D. Having eliminated