There __________ a meeting tomorrow afternoon.

It’s ________ Steve is often late for work with the same excuse ________ annoies his boss.

I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased

Despite the fact ________ they lacked food, the explorers continued towards the goal.

We must work hard to_____ a good knowledge of English.[ ]