Some experts think reading is the fundamental skill upon______school education depends.

Has he passed the exam yet? —No,He ___ it if he had studied harder.

I chose the most popular major instead of my favoriteone，but I had to drop out and started againwhere I＿＿＿have gone in the first place.

We shouldn’t be ashamed of the way we look, ____________?

Only when­­­­­­­­­­­­­­­­­___________ according to the directions can the medicine be quite effective.