1 we won't go climbing if it-------(rain)tomorrow

1.We won't go climing if it rains tomorrow.
2.What will you eat if there is nothing in the refrigerator.
3.Nothing is difficult in the world if you put your heart into it.
4.You will be ok if you take some medicine.
5.What will you do if you meet difficulties in life.
6.If you are nice to others,they will be nice to you.
7.You will lose weight if you eat less and exercise more.
8.You will could /would happen to the computer if you spill water on it.(其实这些句子都是在练习虚拟语气的,if 后面的句子应该用过去式,主句用相应的过去将来时.但不知道你是几年级,所以看到有些句子用了一般现在时,所以,我就都给你用了一般将来时.）