The letter was returned because the person _________ it was addressed had died three years ago.

       A. to whom        B. to which           C. which         D. whom

The girl arranged to have piano lessons at the training center with her sister_________ she would stay for an hour.

       A. where          B. who              C.  which         D. what

 A good idea occurred to Mr. Baker __________ to his invention recently.

       A. while applying                        B. while applied

       C. while he was applying himself            D. while applying himself

One of the main themes of the summit was ‘sustainable development’ or the question _________ we can continue developing the world without damaging the environment.

A .what          B. how              C. why          D. that

-- Must I give the letter to the manager?

   -- No, you may give it to ________ you think is on duty in the office.

       A. whomever      B. no matter who      C. whoever       D. that

Father made a promise ________ I passed the examination he would buy me a new dictionary

       A. that           B. if                C. whether        D. that if

Parents should encourage their children to make friends with such persons _______ good for them in forming good habits.

       A. who is         B. as they are         C. as are          D. that are

The Friendship Store ________ is being rebuilt stands _________ the two main roads meet.

       A. / ; where            B. where; /    C. which; where     D. where ; which

It was in the beautiful park ________ was located by sea _______ we first met our new Chinese teacher.

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

 At 13, Samuel received a training course in drawing for three years, ________ he got an opportunity for further development.

       A. after that           B. after which      C. after it          D. after this