_______ they are twin brothers, they don’t look like each other.
| A．Though | B．Since | C．However | D．When |
The rivers will become dirtier and dirtier ______ we take action to protect them.
| A．since | B．if | C．until | D．unless |
It is helpful to ________ a good habit of reading in language learning.
| A．take | B．show | C．develop | D．match |
-- It will be my turn. I feel a little nervous.
--________ You can make it!
| A．Congratulations! | B．Take it easy. |
| C．kook out! | D．Have a good time. |
-- What was Jim wearing at the party?
-- Nothing ________. He was in his usual shirt and jeans.
| A．special | B．simple | C．important | D．interesting |
-- Tony, ________ are you in such a hurry?
-- The meeting will start soon. I don't want to be late.
| A．where | B．how | C．when | D．why |