Before he went abroad he spent as much time as he _____ English.
| A．could learning | B．learned | C．to learn | D．could learn |
Nuclear science s
hould be developed to benefit people _______ harm them.
| A．more than | B．rather than | C．other than | D．less than |
This problem may _______ more serious ones if left unsolved.
| A．come across | B．refer to | C．carry on | D．lead to |
Crops such as peas or soybeans put important minerals back into the soil, ______ it ready for crops that need fertile soil.
| A．makes | B．to make | C．made | D．making |
You may find it _______ that Charlie was taught to sing as soon as he could speak.
| A．astonishing | B．astonished | C．to be astonished | D．to be astonishing |
Since then, finding ways to grow more peanuts ______ his life goal.
| A．has been | B．were | C．was | D．have been |