We can’t _____ other countries in trade if we don’t develop our national economy.
| A．compete for | B．compete against | C．catch up | D．catch with |
Looking up, I saw some children __________rags were looking at me silently as I ate.
| A．by | B．in | C．with | D．on |
The letter I have been looking forward to _________.
| A．arrive | B．has arrived | C．arriving | D．arrival |
_______is known to us all is that the 2016 Olympic Games will take place in Rio de Janeiro.
| A．What | B．which | C．As | D．It |
--May I use your mobile phone? ---_________.
| A．Why not? | B．OK, enjoy yourself | C．Go ahead | D．You’d better not. |
Many more policeman should be sent to ________them ________some endangered animals.
| A．prevent; to hunt | B．stop; hunting | C．keep; to hunt | D．keep; hunting |