【多选题】Identify which two sentences listed below contain weak and hedging expressions:
A.
For example, in January this person weighed 60.8 kg for eight days.
B.
It may be necessary for the spider to leave the branch on which it is standing, climb up the stem, and walk out along another branch.
C.
For example, it is necessary for the spider to leave the branch on which it is standing, climb up the stem, and walk out along another branch.
D.
There is experimental work to show that a week or ten days may not be long enough and a fortnight to three weeks is probably the best theoretical period.