Life in the oceans ranges from the tiniest plankton(浮游生物) ______ to giants like sharks and whales.
The letters for the boss___________ on his desk but he didn’t read them until 3 days later.
-Can I have a day off tomorrow, Mr. Johnson?
-.I can manage without you.
It was difficult being in a foreign country, ________ if you don’t speak the language.
I ________ like boiled water, but now I love it.
---Who ______ it be that hasn’t handed it in yesterday. ---It _______ be Bob. He handed it in yesterday.