Find ways to praise your children often, you'll find they will open their hearts to you．
| A．till | B．so | C．and | D．while |
The scientists have made an exhaustive study of the virus _______ many people have been inflected.
| A．to which | B．in which | C．with which | D．for which |
When I was in Spain last summer, I ______ quite a lot of Spanish.
| A．made up | B．picked up | C．gave up | D．took up |
It comes as no surprise that many parents walk along their young children ____ their safety.
| A．in search of | B．in place of | C．for fear of | D．for lack of |
Within a few years China ____ well have the most advanced railway industry in the world.
| A．will | B．can | C．must | D．may |
It’s reported that global warming is heating the planet twice as quickly as _____ feared.
| A．extremely | B．previously | C．preciously | D．eventually |