Why didn’t your sister talk with me She is a _____girl. She is afraid of speaking before strangers(陌生人)

Let’s go to the sports centre, shall we –_______．

The road is designed for only motor vehicles, so once _____, bicycles are not allowed to go along it [ ]

We don’t understand the passage ______ there are few new words in it.

_____, I would like to thank Professor Osterhaus for offering me the chance to do this study, and for all the support throughout the study period. [ ]