They waited and waited, and_____ he came back.
| A．at once | B．at first |
| C．at the end | D．at last |
What________you________now？
| A．do，do |
| B．are，doing |
| C．are，do |
| D．do，doing |
—Would you please help me with my writing skills？
—________．You can come to my office every Saturday．
| A．That’s all right |
| B．Not at all |
| C．No problem |
| D．No，thanks |
It’s________outside；please take off your coat．
| A．cold |
| B．sunny |
| C．warm |
| D．dry |
—Sam，come downstairs，please．I need your help．
—Sorry，Mum．I________on the phone．
| A．am talking |
| B．talked |
| C．was talking |
| D．have talked |
My mother________in the kitchen now．
| A．cook |
| B．cooks |
| C．is cooking |
| D．cooked |