—Could you please tell me_______?
—Sorry, you can turn to Mr. Lee for help.
| A．how long can man live without water |
| B．how long could man live without water |
| C．how long man can live without water |
| D．how long man could live without water |
Frank wanted to learn to play _______ guitar, but he didn’t have _______ guitar.
| A．the ; the | B．a ; the | C．the ; a | D．a ; a |
There are a lot of colorful flowers on __________ side of the street.
| A．all | B．both | C．either | D．every |
It’s hot outside, please keep the door __________.
| A．open | B．close | C．opened | D．closed |
I didn’t know he came back __________ I met him in the street .
| A．since | B．when | C．until | D．after |
— Can I help you ?— I’m looking for some _____________.
| A．bottles of orange juice | B．kilos of mango |
| C．packets of salts | D．bag of rice |