1 . ________ case you’re wondering, here’s why mobile data are so expensive in South Africa when compared with other countries. （用适当的词填空）

2 . We’d better leave a message at the information desk _______ _______ somebody should come and visit us. (根据句意填空)

3 . Strasser said Lowell got in through the back door, which he kept open at night so that Bonnie   _____ get into the backyard. (用适当的词填空)