People are living in world where mouse clicks rule our life, so online searches have become _______must.
---- Water can dissolve almost anything and give nutrients to creatures. ---- Yes, and that’s one of its __________.
The student couldn’t _________what the teacher was trying to explain.
It won’t be long before we _____________ a way to overcome the difficulties.
When the future, many people will imagine a life high-tech devices.
---Do you think he will do me a favor?---As far as I know, he is the last one ___ others. He ___ be prepared to give you a hand, though.