I don’t know if he tomorrow. If he , I’ll meet him.
A.will come; comes | B.comes; comes |
C.will come; will come | D.comes; will come |
We won’t put off our plan __________ it snows heavily tomorrow.
A.whether | B.unless |
C.because | D.While |
______ he talked with her for a long time, he failed to convince(说服)her.
A.Though | B.But | C.Since | D.As |
Take a map with you while traveling ________ you have a guide or know the city well.
A.since | B.if | C.unless | D.because |
- The air pollution is terrible.
- It will be worse ________ we take action to protect the environment.
A.if | B.unless | C.until | D.when |