---- Where is Jack?
----He _________ football on the playground with those AFS students, but I am not sure.
| A．must be playing | B．must have played |
| C．may be playing | D．may have played |
Mother went shopping; __________, I cleaned the house.
| A．while | B．when | C．however | D．meanwhile |
Ted will surely finish the job on time he's left to do it in his own way．
| A．so that | B．so long as | C．in case | D．for fear that |
The new tax would force companies to energy-saving measures．
| A．adopt | B．adjust | C．adapt | D．accept |
Tom has no sense of life so he often makes stupid mistakes, making others laugh．
| A．ordinary | B．usual | C．good | D．common |
—Do you have enough to __________ all your daily expenses ?
--- Oh yes, enough and to spare.
| A．cover | B．spend | C．fill | D．offer |