I have been looking for Michael for a whole day. Where ______ he have gone?
| A．should | B．can | C．must | D．may |
Most animals and plants are sensitive _______ sudden changes in temperature.
| A．for | B．with | C．to | D．in |
Water, _______ seems so simple and common, is what makes life possible.
| A．that | B．as | C．what | D．which |
You _______ not drive so fast. There is plenty of time.
| A．need | B．could | C．may | D．can |
I will never forget how happy I was when I _______ China again.
A. set feet in B. set foot in C. put foot in D put feet in
_______ great achievements the future may have in store for China, it’s likely that many of them will be born in northwestern Beijing.
| A．However | B．Whatever | C．No matter what | D．No matter |