I Li Lei since he was a little boy.
| A．know |
| B．knew |
| C．have known |
| D．had known |
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 |
My brother likes eating very much but he isn't very _____ about the food he eats.
| A．curious | B．content | C．harmful | D．ordinary |