_______ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B．As far as | C．If only | D．So long as |
He’s trained hard for the last two years. It is ______ he did so well at the track and field meet yesterday.
| A．no problem | B．no wonder | C．no doubt | D．no way |
By the time he realizes he ______ into a trap, it’ll be too late for him to do anything about it.
| A．walks | B．walked | C．has walked | D．had walked |
After being criticized by her mother, she spoke out the words ______ in her heart for many years, tears ________ her eyes.
| A．having hidden; filling | B．hidden; filled |
| C．hiding; being filled | D．hidden; filling |
The new equipment ________ the disabled during the 8th National Paralympics.
| A．was intended for | B．was intended to | C．intended for | D．intended to |
Smiles around the world _____ be false, ______ other feelings like anger, fear or worry.
| A．must; hide | B．must; hiding | C．can; hide | D．can; hiding |