1 . Yuan Longping is the first agricultural pioneer ________ hybrid rice.

A．to grow

B．grow

C．grew

D．growing

2 . He found it difficult to make a choice because the advantages and disadvantages seem to ___each other.

A．respond to

B．cancel out

C．get a foothold in

D．attach to

3 . I’m trying to persuade my dad ________ some shares.

A．to buying

B．to buy

C．buying

D．in buying

4 . Robert often asks us ________ his Chinese, so his Chinese is much better than before.

A．help him

B．to help him with

C．to help with

D．helps him with

5 . For the world to meet the goals of the Paris agreement, _________ the average global temperature rise to 1.5°C above pre-industrial levels will take immediate action from every country.

A．to limit

B．being limited

C．limited

D．having limited

6 . We need a society _________ around the belief that we can all learn and grow throughout our lives, that none of us has perfect knowledge, and that a good deal of learning is always yet _________ .

A．building; to come

B．built; to come

C．to be built; coming

D．being built; coming

7 . It must be great fun_________ to the moon in a spaceship.

A．flying

B．flies

C．to have flied

D．to fly

8 . The lonely boy doesn’t seem _______ many friends.

A．have

B．to have

C．has

D．having

9 . Carbon emissions from human activities are partly to ______ our warming planet.

A．be blamed for

B．be blamed on

C．blame on

D．blame for

10 . 保持学习与社会生活的平衡很重要，因此你最好参加这个社团。
It’s important to _______________, so you’d better join this club.