2 . We will put off the picnic in the park until next week, _______ the weather may be better.

A．where

B．which

C．who

D．when

4 . By last Sunday, Heilongjiang had reported 145 confirmed cases since Jan 10, _____ the first asymptomatic(无症状的) carrier of the current outbreak was reported.

A．when

B．which

C．as

D．who

5 . Students should take an active part in community activities _____ they can gain experience for their future development.

A．when

B．which

C．where

D．whose

6 . Between the two halves of the football game is a 15-minute break, __________ the audience can have a rest．

A．when

B．where

C．which

D．that

7 . On receiving the call， the police rushed to the scene，___a traffic accident happened.（用适当的单词填空）

8 . I like to go shopping on weekdays,__________ the shop isn’t crowded. (用适当的词填空)

9 . The Western holiday Halloween also had its origin in old beliefs about the return of the spirits of dead people. It is now a children’s festival，这个时候他们打扮起来去他们邻居家索要糖果(dress) _____________________________.(根据汉语内容和所给的提示词，完成句子)

10 . Mr. Smith owned this oil painting until the early 1990 s, ____________he gave it to his grandson.

A．which

B．when

C．where

D．who