No matter what happens，be sure you always do you think is your duty.

Rather than ___ on a crowded bus, Tom always prefers __ a bicycle.

It was my sister firsthad the idea to cycle along the entire Mekong River from ______ it began towhere it ends

What a table! I’ve never seen such a thing before. Itis____long.

Mr. Smith, _____ of the ______ speech, started to read a novel.