1:Tomorrow ,they ____the mountain
A:would be climbing B:will be climbing C:will climb D:would clime
2:I dont,s know whether it will rain or not ,but if it__,I shall stay at home.
A:will B:rains C:was D:does
3:The sun __early in summer.
A:always rises B:doesn,t prefer C:is always rising D:will rise
4:I like black tea ,but Tom___green tea .
A:don,t prefer B:doesn,t prefer C:perfers D:will prefer
5:If you ___smoking ,your health will improve soon.
A:gave up B:have given up C:give up D:will give up
(请详细解释选择的原因,