5．Great changes have taken place in our country ___________(近来).

4．Even during the holiday, library and gym can be __________(可以使用的) in our school.

3．Visitors are not allowed to touch anything that is being d________ in the museum.

2．I_________ he got home, Mr. Burke began to do the housework.

1．Since his childhood, Lang Lang has d_______ an interest in music.

35.　 Helen and Linda were introduced to each other _________ at a party.

A. for the first time B. the first time　　　　　　 C. all the time　　　 D. for some time