Shopping online can _____ both convenience and choice, but not _____ websites are safe enough for shopping.
| A．charge; either | B．supply; any | C．offer; all | D．provide; both |
__________ you may have, you should gather your courage to face the challenge.
| A．However a serious problem |
| B．What a serious problem |
| C．However serious a problem |
| D．What serious a problem |
__________ we all tried our best, we lost the game in the end.
| A．As |
| B．Although |
| C．Because |
| D．Since |
__________ I couldn't fully under-stand what he wanted to show in his paintings, I thought his works quite impressive.
| A．As |
| B．Since |
| C．If |
| D．While |
Hot __________ the night air was, we slept deeply because we were so tired after the long journey.
| A．although |
| B．as |
| C．while |
| D．however |
One can always manage to do more things, no matter __________ full one's schedule is in life.
| A．how |
| B．what |
| C．when |
| D．where |