I go _____ to the stadium when there’s a game, but usually I watch it on TV.

These problems are different from each other, so they should be dealt with         .

—Mom，dad is smoking again!—Well，let him cut it ________ gradually since old habits die hard.

He said he would come . He didn't _______.

When asked why he prefers bikes to buses, the professor said,  “Riding a bicycle takes __________ half an hour, but it’s more convenient and environmentally friendly. ”