Did you know any French before you arrived in Washington? —Never ___ it, actually．

This must be a footprint of a tiger. — It ____ be. A tiger’s should be much larger and deeper than this.

Siberian Tigers ________ and killed at such a speed that they will disappear from the earth in the near future

It’s nice to see you again What_________since we last met

The weather was bad and the food was terrible , ___the holiday was very disappointing