A Colorado woman said that her iPhone 4 ______ fire while charging overnight.
| A．had caught | B．has caught fire | C．was catching | D．caught |
— I phoned you at 7 yesterday evening but nobody answered.
— Oh, I _______my dog in the park then.
| A．walked | B．was walking | C．had walked | D．would walk |
Will was lying on the grass, _______the sky thick with stars.
| A．his eyes fixing on | B．fixed his eyes on |
| C．his eyes were fixed on | D．his eyes fixed on |
The teacher, along with 5 of her students, ________talking with a foreign teacher in the English Corner at that time.
| A．was | B．were | C．had been | D．would be |
Gaining the knowledge ________ environmental protection will help you to become a qualified environmentalist.
| A．addicted to | B．concerned about | C．related to | D．appealed to |
— Try not to work yourself too hard. Take it easy.
— Thanks. __________
| A．So what? | B．No way. | C．What for? | D．You too. |