---In recent years, _____ problem of global warming has been very serious.
---That’s right. People are facing ____ number of natural disasters now.
| A. the; a |
B. a; the |
C. a; a |
D. the; the |
—So you missed the English class this morning?
—______ I arrived 20 minutes after it started.
| A．Not exactly. | B．Not necessarily. | C．Not nearly. | D．Not likely. |
The young man, ______ several attempts to break the world record in high jumping, decided to have another try.
| A．to make | B．making | C．made | D．having made |
Why not take up some outdoor sports to relax ______ office work? It will also help keep you healthy.
| A．for | B．from | C．on | D．of |
______ you are familiar with the author’s ideas, try reading all the sections as quickly as possible.
| A．Now that | B．Ever since | C．In case | D．As long as |
No one can walk the wire in the air without a bit of fear unless ______ very young.
| A．having trained | B．trained |
| C．to be trained | D．being trained |