Facing the poor grades, Maria is wondering what it to learn English well.
| A．takes | B．uses | C．makes | D．prepares |
A lot of language learning,________ has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.
| A．as | B．it | C．which | D．this |
Between the two parts of the concert is an interval,________ the audience can buy ice-cream.
| A．when | B．where | C．that | D．which |
The printer is of good quality. If it ________ break down within the first year, we would repair it at our expense.
| A．would | B．should | C．could | D．might |
They use computers to keep the traffic _________ smoothly.
| A．being run | B．run |
| C．to run | D．running |
I got to the office earlier that day,________ the 7:30 train from Paddington.
| A．caught | B．to have caught |
| C．to catch | D．having caught |