- Look what a heavy rain! What shall we do now? it’s raining hard let’s stay at

问题补充：

--- Look, what a heavy rain! What shall we do now?

--- it’s raining hard, let’s stay at home to surf on the Internet.

A. So

B. Since

C. Though

D. If

答案：

A. So

(答案→)B. Since

C. Though

D. If

解析：since 表示因为，只有此连接词才能符合题意，故选B