It was playing computer games _____ cost the boy plenty of time _______ he ought to have spent doing his lessons.

He asked me about the best way____ more English words

This is _____ best kind of _____ pen you can get here.

On the National Day, up _____ into the air. Then the crowed cheered.

People choose high-speed train or self-driving to travel on holidays. –______ fast the traditional travel ways change!