Life in cities is much livelier than ________ in the country.
| A．/ | B．that | C．it | D．the one |
____ late in the morning, Bob turned off the alarm.
| A．To sleep | B．Sleeping | C．Sleep | D．Having slept |
It is only when the disease has progressed to the AIDS ____ a person begins to look sick.
| A．which | B．what | C．who | D．that |
The warmth of ____sweater will of course be determined by the sort of ____wool used.
| A．the, the | B．the, / | C．/, the | D．/,/ |
— Can you keep an eye on my bag, Tom? I just want to use the bathroom.
—____. It will be safe with me.
| A．Go ahead | B．I think so | C．Not at all | D．You’re welcome |
The road is covered with snow. I can’t understand _____ they want to go to school by motorbike.
| A．why | B．when | C．since | D．that |