【即学活用】用合适的连词填空。

1). Work hard, you w on't pass the exam.

2). Get up early tomorrow, you'll catch the early bus.

3). (2014•天津高考)Give me a chance, _________ I'll give you a wonderful surprise.

A. if　　　　　B. or　　　　　C. and　　　　D. while

4). (2014•大纲版全国卷) __ _________ me tomorrow and I'll let you know the lab result.

A. Calling B. Call C. To call D. Having called