_____ important for us _____wild animals and birds.
| A．It; protect | B．It; protecting |
| C．It’s; to protect | D．They’re; protect |
Yu Min _____ in the physics field for many years. He is called the Father of Hydrogen Bomb (氢弹之父). He in the winner of the award for Supreme Science and Technology of China,
| A．has worked | B．works |
| C．worked | D．had worked |
Neither the children nor their mother _____ scary movies when Mr White is away.
| A．enjoy | B．enjoyed | C．enjoys | D．enjoying |
--- Lily, whose backpack is this?
--- I think it _____ be Peter’s. Look! His name is on it.
| A．can | B．should | C．must | D．Could |
The group of people _____ the hotel after walking for 6 hours. They needed to have a rest.
| A．arrived at | B．arrived in | C．got | D．Reach |
The little boy could _____ speak when he was 2 years old, but now he can sing wonderfully.
| A．hard | B．hardly | C．never | D．Ever |