| A．15 minutes | B．15 years | C．15 days |
| A．be | B．to be | C．is |
| A．leave | B．leaves | C．leaved | D．left |
| A．have | B．has | C．having |
| A．is changing | B．has changed |
| C．will have changed | D．will change |
| A．was being built | B．is built |
| C．is being built | D．builds |
| A．is playing | B．are playing |
| C．play the | D．play a |
| A．reads | B．reading | C．is reading | D．read |
| A．How old are you? |
| B．What’s the time? |
| C．What’s your watch? |
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