Only when __________________ permission _______________ allowed to enter the lab.
| A．a teacher has given; are the students | B．has a teacher given; are the students. |
| C．has a teacher given; the students are | D．a teacher has given; the students are |
The competition for job hunting issince there are more and more college graduates.
| A．painful | B．regular | C．powerful | D．fierce |
— Are you going to live with us this summer, Auntie Rosemary?
— ______, dear.
| A．I don’t expect so | B．Don’t mention it | C．Never mind | D．It doesn’t matter |
Washington ______ get very hot and sticky in summertime. July and August are usually the warmest months.
| A．must | B．can | C．should | D．might |
As is known to all language learners, newly learnt words will soon be forgotten unless ______ used in everyday communication.
| A．exactly | B．finally | C．gradually | D．frequently |
This approach, ______ more expensive than the basic one, provides us with considerably more usage flexibility.
| A．as | B．since | C．while | D．if |