26. It is usually not quite cold in this area in March, but sometimes the temperature ______be very low.
| A．can | B．should | C．must | D．shall |
Vitamin D helps our bodies make a special chemical，and this special chemical, ______
affects our brains，making us feel happy．
| A．in turn | B．in particular | C．in advance | D．in short |
Everyone must have known the death of the waitress, __________?
| A．must they | B．mustn't they | C．haven't they | D．have they |
．一 Tony is such a selfish person．
一 I agree. Never again ________ with him.
| A．1 will deal | B．I do deal | C．will I deal | D．do I deal |
After driving for 20 miles，Jackson realized that he ________in the wrong direction．
| A．was driving | B．drove | C．had been driving | D．had driven |
We know it is hard to make such a decision _______he has just built up the team for a year
and the project is going through the important stage now．
A．that B．as C．when D before