Recently some studies have found that learning ____________ second language can lead to _______________ increase in one’s brain power.
| A．a; the | B．不填; the | C．a; an | D．the; an |
.While shopping, people sometimes can’t help ___ into buying something they don’t really need.
| A．to persuaded | B．persuading | C．being persuaded | D．be persuaded |
.Having a trip abroad is certainly good for the old couple, but it remains ___ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．seen |
.When and where to go for the on-salary holiday ___ yet.
| A．are not decided | B．have not been decided | C．is not being decided | D．has not been decided |
.The manager entered the office and was happy to learn that four-fifths of the tickets ___.
| A．was booked | B．had been booked | C．were booked | D．have been booked |
.This is Ted’s phone. We miss him a lot. He ___ trying to save a child in the earthquake.
| A．killed | B．is killed | C．was killed | D．was killing |